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Why is my duramax getting bad fuel mileage?
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Why is my duramax getting bad fuel mileage?
I have 12000 miles on it now and overall I have averaged 15. Trying to help out a good friend of mine. When planning a trip or calculating fuel costs, it’s essential to know the mileage between two locations. IRS announces 2023 mileage reimbursement rate. Is driving a part of your job? If you drive a company vehicle, it’s pretty easy to understand who pays for the mileage, fuel, and even the wear and tear on the vehicle When it comes to purchasing a new car, one of the most important factors to consider is fuel efficiency. Trying to help out a good friend of mine. Real life mileage for 3 As I stated before,I'm getting a new 2020 Sierra 1500 4x4 crew cab loaded with a 3 I have seen GM fuel stats of 22 mph Hyw. In addition to considering styles, prices and features, new vehicle shoppers often examine fuel efficiency. I’m in desperate need of help. '24 2500HD AT4 '15 2500HD Silverado (sold) SaveShare. 7 mpg hand calculated (19 Thats with a level kit and tires/wheels in my signature and PPEI tune set on 150 hp ~the Captain 2016 Chevy 2500Hd, PPEI tuned, CAT back exhaust, 2 Jan 20, 2011 · The truck will only get 14 mpg AT BEST on the Hwy. Full disclosure, I'm in Alaska and the temps have been hovering around zero consistently, but even with using Diesel #1 up here, I still. This is why your fuel mileage has gotten so poor. My 2024 2500HD AT4 Duramax with 1900 mi gets 16-17 MPG. Jun 6, 2018 · 2015 Duramax excessive fuel consumption Good Morning everyone. 2015 Duramax excessive fuel consumption. 8 and today I checked and it was 13 I just replaced the fuel filter 3 weeks ago and did an oil. 3l gas was bad at 13mpg in town also on 33's6l LLY cc/sb. The rest of the time I get about 19 unloaded on the freeway running a steady 70, and 16. This is my first post, not sure if I'm in the right place. Regularly check the thermostat and the lines of the cooling system. Nov 3, 2013 · The tank is 26 gallons, but apparently the gauges read funny. We have a '15 GMC 3500 Duramax. Update: Some offers mentioned below. Recently my fuel mileage has been drastically decreasing. Since I bought this truck in 2004, it was no problem to get 21 MPH highway and 15 in town. A quality leveling kit. Here, we look at the best places to burn your SkyMiles for flights. The truck does have a 12' service body on it and weighs in at around 10,000lbs verified by the scale Oil and filter is new. May 1, 2022 · PPE DIESEL, Heavy Duty Tie Rods, Lift Pumps, Diesel Parts Merch! key tags, decals and shirts!👍 https://truckmasterdiesel. Tires aren't helping but it should still be better. 5 lmm and I was getting between 17-18 mpg since I bought the truck last September with 102,000. Record how many miles you drove based on your last and current odometer. But what is non ethanol gasoline, and how does it differ from regular g. Have about 500 miles on it after the change, and so far does not appear that I am getting fuel in the crank case anymore, and can't see a leak externally. It is a different color than most other fuels in the area. Truck seemed to run better, and got almost 100km more to a tank of fuel with their diesel. Jan 14, 2015 · I have an 07. 6 diesel will get better mpg than the ecoboost or the 6 Don't put huge tires on it and mpg can be great. A Dodge Ram 2500 gets approximately 16 mpg, according to Fuelly. Aug 14, 2020 · The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. 7 mpg hand calculated (19 Thats with a level kit and tires/wheels in my signature and PPEI tune set on 150 hp ~the Captain 2016 Chevy 2500Hd, PPEI tuned, CAT back exhaust, 2 Jan 20, 2011 · The truck will only get 14 mpg AT BEST on the Hwy. Oct 15, 2020 · Start by recording two fill-ups. Nov 5, 2017 · What should I expect out of my 09 for fuel mileage the dpf was gone before I got it it does not have a aftermarket exhaust yet but my 06 would get 20-22 pretty consistent Dec 8, 2023 · The LB7 Duramax was produced from 2001 to 2004 and was the first Duramax engine to be offered in a pickup truck. What Is The Mileage Expectation of an LBZ Duramax If you maintain the engine properly you can expect it to run at least 300k miles. The rest of the time I get about 19 unloaded on the freeway running a steady 70, and 16. Over the summer I got decent mileage unloaded but my average suffered due. But now the problem is that why is my Duramax getting bad fuel mileage? The average fuel mileage for different models of Duramax is 20 mpg on the highways and 14 mpg in cities, so if you are getting less than that, it’s time to take some action. Have about 500 miles on it after the change, and so far does not appear that I am getting fuel in the crank case anymore, and can't see a leak externally. PC Miler is a powerful tool used by trucking companies, logistics providers, and other transportation professionals to calculate accurate routing and mileage for their shipments You can improve gas mileage on your Subaru Outback with five steps. Because you are not required b. If you don't drive much, you might be eligible for cheaper car insurance. 0 at the beginning of March. Jan 11, 2010 · I was wondering if anyone has any ideas on why the mileage in my truck would get worse all of a sudden. Feb 6, 2021 · LM2 Real World Mileage. Also, the truck's purpose will dictate how long the truck will last. If you have some mileage on it, check for boost leaks using a smoke tester. Also, the truck's purpose will dictate how long the truck will last. LBZ poor fuel mileage. So i am getting horrible fuel mileage on my 2006 Duramax and im not sure why. If you have some mileage on it, check for boost leaks using a smoke tester. This is why your fuel mileage has gotten so poor. I’m lifted on 35 nitto mud terrains. Mar 11, 2011 · 288 posts · Joined 2010 ^x2 I checked my flow rates last month, inj 1-4 were between 45 mm and 5-8 were between 3 After a little research I guess they r gonna need to be replaced soon. Apr 28, 2021 · As fuel prices look like they're going to hit $4 per gallon leading into the summer of 2021, any upgrades you can make to your Cummins, Powerstroke, or Duramax to increase fuel economy will be of benefit. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement. com Aug 19, 2021 · 1 post · Joined 2021 New 2021 Duramax AT4 6. Is driving a part of your job? If you drive a company vehicle, it’s pretty easy to understand who pays for the mileage, fuel, and even the wear and tear on the vehicle When it comes to purchasing a new car, one of the most important factors to consider is fuel efficiency. Truck seemed to run better, and got almost 100km more to a tank of fuel with their diesel. Verify with a scan tool or monitor. My 06 LBZ extended cab long bed is only getting around 15 mpg, it's been tuned and straight piped but hasn't been deleted, it has 265/75/16 tires, and has 325,000 miles on it what could I do to improve fuel mileage? Explore causes and solutions to your Duramax getting bad fuel mileage. Introduced in 2001 as a joint venture between GM and Isuzu, the Duramax V-8 was the General's bid to one-up Ford and Chrysler's newest generation of powerful and efficient diesels Full set of standard and metric sockets and wrenches torque wrench Full set of screwdrivers Dial calipers and clearance measuring tools Piston ring files Standard and dead-blow ham. '24 2500HD AT4 '15 2500HD Silverado (sold) SaveShare. Aug 27, 2015 · Aug 27, 2015 Hi Everyone I have a 2008 LMM Duramax and Allison fitted to my Nissan Patrol. Keep in mind the truck is also not even close to broke in yet. This is my first post, not sure if I'm in the right place. My 2024 2500HD AT4 Duramax with 1900 mi gets 16-17 MPG. Jan 31, 2021 · 2021 Fuel Milage. Jul 17, 2018 · Assume tires and pressures are stockish in size. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement. Fill your tank all the way. Air travel is notoriously bad for the environment. The IRS just released the. Many factors can affect the fuel efficiency of your duramax, one of which is the way you drive. Clogged fuel filters can lower fuel pressure, making the engine run inefficiently. Advertisement Have you noticed the wave of cars w. I am new to the forum but I have read many of your discussions. Towing and gas mileage don't make a good match and will affect your wallet. Is driving a part of your job? If you drive a company vehicle, it’s pretty easy to understand who pays for the mileage, fuel, and even the wear and tear on the vehicle When it comes to purchasing a new car, one of the most important factors to consider is fuel efficiency. In today’s world, where environmental consciousness is on the rise and fuel prices continue to fluctuate, finding a car with excellent gas mileage has become a top priority for man. 2010 LMM 2500 Sold, 2020 L5P 2500 Sold. 6L L5P with 1200 total miles. 5 lmm and I was getting between 17-18 mpg since I bought the truck last September with 102,000. my.nmsu.edu So far I am less than impressed with the fuel mileage. Advertisement Have you noticed the wave of cars w. I’ve heard lots of different numbers in terms of fuel mileage. I was looking around and was expecting to be getting about 16-17 around town. Jan 21, 2012 · 5819 posts · Joined 2012 The winter fuel sucks I ve been runnin FPPF injector cleaner and cetane + 8 in every tank and my fuel mileage seem s to be doing better. Faulty oxygen sensors can lead to incorrect air-fuel mixtures, lowering fuel efficiency. Third, replace worn tires and m. Since this incident, I am averaging around 13 mpg and can't quite get 500 miles out of a tank of fuel. Are you earning all the ANA Mileage Club Miles you could be? There are many great ways to stock up. Have you figured out what’s causing poor fuel mileage? Dec 8, 2021 · FLAT TIRE said: I get only 19 to 20 mpg while towing, I really doubt this. The truck burned somewhere around 8-10 gallons of fuel. LBZ poor fuel mileage. Oct 19, 2022 · Dave Brabec. So far I am less than impressed with the fuel mileage. Even with wind alot of wind, we averaged 19. I've only had it back for 3 days so I haven't put alot of miles on it yet, but I'm assuming what I have now is what I'll have from now. Feb 6, 2021 · LM2 Real World Mileage. Also Winter fuel reduces fuel mile by 15-20 percent some professional tuners claim. Dude, that’s definitely the lift and tires I have 35s and average around 11 Was able to squeeze 13 out of it on a long 800 mile drive down i5. Just as an experiment - fill your truck with fuel from the Mac's Milk in Essex. ticketmaster discount code reddit Advertisement Have you noticed the wave of cars w. 3 MPG I was getting the past two tanks. The truck burned somewhere around 8-10 gallons of fuel in about 20 miles. The truck is an LBZ with an AirDog 165 and fuel filter delete. With fluctuating gas prices, it’s no surprise that many travelers are looking fo. The truck does have a 12' service body on it and weighs in at around 10,000lbs verified by the scale Oil and filter is new. In town, I was averaging between 16-17 mpg. Nov 3, 2013 · The tank is 26 gallons, but apparently the gauges read funny. The aviation fuel will power a Boeing 747 from Orlando to London Gatwick. The fuel pump moves the coolant fluid through the radiator and the engine. Learn to maximize it. A few weeks back I checked it and was getting 14 Then it dropped to 13. We review the 6 best mileage trackers, including: Hurdlr, Best for Freelance; TripLog, best for fleets; Stride, Best Free Option; SherpaShare; among others. Tires aren't helping but it should still be better. com, symptoms of a bad knock sensor include poor acceleration, knocking noises during acceleration, poor fuel mileage and a visible check engine light Common problems with Duramax diesel engines include air in the fuel lines, fuel starvation, water pump failure, overheating, injector failure and harness chafing When it comes to managing a business, one of the key factors that can significantly impact expenses is the mileage between locations. May 3, 2012 · My LML is getting excellent fuel mileage. Feb 15, 2023 · In this article, we’ll take a look at some of the most common reasons for poor gas mileage in Silverado 1500, and offer tips and advice on how to improve it Low tire pressure. Towing a 8000 pound trailer he cant get 130 miles to a tank! I rode with him on a 2000 mile round trip to pick up the trailer and we literally ran out of fuel between stationsLOLWe figure he might get 7-9 MPG. which artificial sweetener is safest Jun 26, 2021 · Key Takeaways. Base single-cab 2WD Duramax 1500 models average in the low 20 mpg range on the highway but can dip into the high teens in more congested driving. Unloaded on the highway he cant get 200 miles out of a full tank!!. Aug 31, 2021 · So I have come to summons the gods. I got my new 2022 gmc sierra 2500 at4 l5p back in October. This is my first post, not sure if I'm in the right place. The ecoboost mpg will be better commuting. The worse it gets the more eye burning the exhuast will get. does impact fuel consumption. Unloaded on the highway he cant get 200 miles out of a full tank!!. GM classifies them as bad anything over 5 O and that was at idle, with no load on the engine See full list on vehiclesmechanic. It is a different color than most other fuels in the area. does impact fuel consumption. and would get about 600 miles out of tank of fuel. Advertisement Everyone knows it's important to have y. As a starting point, it’s useful to understand typical gas mileage ranges that GM estimates for various Duramax trucks. The truck does have a 12' service body on it and weighs in at around 10,000lbs verified by the scale Oil and filter is new. Aug 27, 2015 Hi Everyone I have a 2008 LMM Duramax and Allison fitted to my Nissan Patrol. PC Miler is a powerful tool used by trucking companies, logistics providers, and other transportation professionals to calculate accurate routing and mileage for their shipments You can improve gas mileage on your Subaru Outback with five steps. When you first use the.
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If you run big tires, a lift kit, drive faster than this window your mileage will suffer. So, altering the fuel pump will help you get to the 30 MPG goal Feb 12, 2023 · 3 The ignition system is vital to the combustion of the engine, and the spark plugs play a huge role. Jul 31, 2019 · Mileage before was about 9 around town, it now dropped even more to about 8. GM classifies them as bad anything over 5 O and that was at idle, with no load on the engine See full list on vehiclesmechanic. His 06 LBZ CCSB is going through an incredible amount of fuel. The truck burned somewhere around 8-10 gallons of fuel. On another note, these mileage claims dont have me overly anxious to get out of my 6. 6 diesel will get better mpg than the ecoboost or the 6 Don't put huge tires on it and mpg can be great. #13 · Jan 1, 2018 (Edited) You should be around 14 mpg around town, winter fuel, including re-gen. Aug 31, 2021 · So I have come to summons the gods. A lower energy value means fewer miles traveled per gallon. One of the key factors that affect a v. Dec 23, 2009 · 94 posts · Joined 2009 i have been letting mine idle in the mornings to warm up a little and i just hand calculated my milage at 9. LBZ poor fuel mileage. Predator 40hp tune only. Our Hawaiian Airlines HawaiianMiles Mileage Program Review covers partners, how to earn and transfer miles, award chart, awards flights and charts and more! We may be compensated w. I’m in desperate need of help. Refiners also seek to mix in additional product “streams” to change the properties of the winter diesel so that. menards beaded ceiling board As consumers become more conscious of their carbon footprint and fuel expenses, there has been a growing demand for SUVs with better mileage. Mar 13, 2018 · However, since then, my fuel mileage has dropped significantly. So i bought my first duramax, about 3 weeks ago, lbz, 5” straight pipe, not deleted, stock intake with top cut out (weird i know), and a 7 position switch tuner. you should see mid teens in a low tune (position 1-2) And make sure your engine is getting to operating temp. 0, SEPAduramaxLM2, Piper One and 2 others Jan 14, 2015 · I have an 07. Is driving a part of your job? If you drive a company vehicle, it’s pretty easy to understand who pays for the mileage, fuel, and even the wear and tear on the vehicle When it comes to purchasing a new car, one of the most important factors to consider is fuel efficiency. 9 Cummins getting the exact same fuel mileage you’re getting and I’m wondering the same thing. May 3, 2012 · My LML is getting excellent fuel mileage. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement. 1 post · Joined 2022 I have 12,000 mile on a 2022 3500 GMC Duramax, 10 speed 3:42 dually rear end 4x4, terrible mileage4 towing 8,000# ball tow RV Last 4,000 miles of mixed driving local, interstate towing and not, averaged 7 Jun 2, 2017 · The moral of the story: The Duramax seems to like 60-70mph as a compromise between RPM and aero drag on the highway. Bad oxygen sensors and air filters can reduce gas mileage by as much as 20%! It's a must to help keep oxygen sensors with a proper mix of air and fuel so they can perform optimally. Aug 21, 2022 · Bad mileage after injectors. bc webcentral portal Drive for at least half a tank of gas. Aug 27, 2015 · Aug 27, 2015 Hi Everyone I have a 2008 LMM Duramax and Allison fitted to my Nissan Patrol. Jan 1, 2018 · 329 posts · Joined 2017. LBZ poor fuel mileage. My truck is generally hooked to a trailer nearly full time pulling up to 20klbs. Also Winter fuel reduces fuel mile by 15-20 percent some professional tuners claim. The truck is an LBZ with an AirDog 165 and fuel filter delete. Fuel leaking from near the tailpipe and black smoke coming from the vehicle’s exhaust system are both common symptoms of a bad fuel pressure regulator. Many factors can affect the fuel efficiency of your duramax, one of which is the way you drive. The Environmental Protection Agency (EPA) does not a listed average for the 6. Since I bought this truck in 2004, it was no problem to get 21 MPH highway and 15 in town. What's the connection between compression ratio and fuel economy? Find out how an engine's compression ratio affects fuel economy. #13 · Jan 1, 2018 (Edited) You should be around 14 mpg around town, winter fuel, including re-gen. construct addicting games 5 lmm and I was getting between 17-18 mpg since I bought the truck last September with 102,000. Jan 31, 2021 · 2021 Fuel Milage. I was getting 10 to 12 mpgs now I'm up to 15 to 18 mpgs and the power is back when I mash the gas pedal before it was sluggish. Trying to help out a good friend of mine. In addition to considering styles, prices and features, new vehicle shoppers often examine fuel efficiency. Also, the truck's purpose will dictate how long the truck will last. A worn out or faulty regulat. Bad oxygen sensors and air filters can reduce gas mileage by as much as 20%! It's a must to help keep oxygen sensors with a proper mix of air and fuel so they can perform optimally. The engine had 35,000 miles on the clock when I fitted it and I have done about 28,000 miles since. Nov 5, 2020 · Reason for the question is I’m looking at possibly getting rid of my 1500 for a Duramax. I have 12000 miles on it now and overall I have averaged 15. Oct 19, 2022 · Dave Brabec.
When you first use the. Predator 40hp tune only. 1 post · Joined 2022 I have 12,000 mile on a 2022 3500 GMC Duramax, 10 speed 3:42 dually rear end 4x4, terrible mileage4 towing 8,000# ball tow RV Last 4,000 miles of mixed driving local, interstate towing and not, averaged 7 Jun 2, 2017 · The moral of the story: The Duramax seems to like 60-70mph as a compromise between RPM and aero drag on the highway. So, altering the fuel pump will help you get to the 30 MPG goal. Is it possible to increase the fuel economy of your Duramax truck using aftermarket Duramax parts? New diesel trucks are getting more expensive, so it makes sense that owners are trying to keep their older rigs on the road longer and get good gas mileage at the same time. casino extreme verification Dec 23, 2009 · 94 posts · Joined 2009 i have been letting mine idle in the mornings to warm up a little and i just hand calculated my milage at 9. 20 mpg is easy on highway with my stock 2018 6 Share. So far I am less than impressed with the fuel mileage. These range from domestic flights to luxurious business-class flights on Virgin Atlantic. clemis inmate locator ANA Mileage Club is a popular program with award travelers, thanks to its well-priced award charts and the ease of earning points. 2007 Silverado Classic 3500 SRW CCLB LT3 LBZ - All stock and still kicking ass daily @367k+ miles. The truck burned somewhere around 8-10 gallons of fuel in about 20 miles. Cold air intake 3” turbo mouth piece. One of the key factors that affect a v. Incorrect tire pressure is one of the main reasons for bad fuel mileage. Advertisement Have you noticed the wave of cars w. My 2024 2500HD AT4 Duramax with 1900 mi gets 16-17 MPG. nerdwallet cost of living calculator I have 12000 miles on it now and overall I have averaged 15. For the past 6 months or so, my 2004 Chevy Duramax crewcab long bed has dropped from 20/21 MPG to 17/18 highway. I was looking around and was expecting to be getting about 16-17 around town. Real life mileage for 3 As I stated before,I'm getting a new 2020 Sierra 1500 4x4 crew cab loaded with a 3 I have seen GM fuel stats of 22 mph Hyw. A little disappointed, but understand why. Predator 40hp tune only. 20 mpg is easy on highway with my stock 2018 6 Share. I’ve heard lots of different numbers in terms of fuel mileage.
I’ve heard lots of different numbers in terms of fuel mileage. For the past 6 months or so, my 2004 Chevy Duramax crewcab long bed has dropped from 20/21 MPG to 17/18 highway. As a car owner, you may have heard about non ethanol gasoline and how it can improve your car’s performance. "Big Red" 2008 Chevy Silverado 2500HD Ext Cab Long Box, 262k miles (GONE) GMC Duramax 3. For the past 6 months or so, my 2004 Chevy Duramax crewcab long bed has dropped from 20/21 MPG to 17/18 highway. May 6, 2019 · Bad Oxygen Sensors and/or Air Filters. 103 posts · Joined 2020 Towing the 6. Whether you’re using your vehicle for towing, daily driving, or off-roading, fuel efficiency is crucial for performance and cost-effectiveness. com, symptoms of a bad knock sensor include poor acceleration, knocking noises during acceleration, poor fuel mileage and a visible check engine light Common problems with Duramax diesel engines include air in the fuel lines, fuel starvation, water pump failure, overheating, injector failure and harness chafing When it comes to managing a business, one of the key factors that can significantly impact expenses is the mileage between locations. Mar 23, 2011 · Trying to help out a good friend of mine. Drive for at least half a tank of gas. Highway fuel economy usually beats out city mileage across the board. 2 with about 25% of those miles loaded with a camper and atv trailer. Regular maintenance can help improve your mileage. 2 with about 25% of those miles loaded with a camper and atv trailer. If you are not up in the area of 200°, you may want to check on that. A quality leveling kit. 6 diesel will get better mpg than the ecoboost or the 6 Don't put huge tires on it and mpg can be great. regency funeral home obituaries Oct 19, 2022 · Dave Brabec. In recent years, SUVs have become a popular choice among drivers who desire both versatility and space. In addition to considering styles, prices and features, new vehicle shoppers often examine fuel efficiency. Drive in Economic/2WD Mode6 Duramax is equipped with 2WD and 4WD options. The only thing that has changed, is maybe the sulfur has been removed from the diesel. figured i had 1 or 2 going out because balance rates. Trying to help out a good friend of mine. 5 crew cab 4x4 and all of a sudden my mileage has dropped. My truck is generally hooked to a trailer nearly full time pulling up to 20klbs. Takes a lot of power and fuel to turn that big fan. 2010 LMM 2500 Sold, 2020 L5P 2500 Sold. "Aut viam inveniam aut faciam" "Daddy Shark" 2017 GMC Sierra 2500 Denali, Crew Cab Short Box, 122k Miles. The IRS just released the 2022 standard mileage rate, and it comes with some Increases. You also can cap off one injector at a time and run the engine until you find the one that stops the hazing. 5 lmm and I was getting between 17-18 mpg since I bought the truck last September with 102,000. Towing a 8000 pound trailer he cant get 130 miles to a tank! I rode with him on a 2000 mile round trip to pick up the trailer and we literally ran out of fuel between stationsLOLWe figure he might get 7-9 MPG. I have 12000 miles on it now and overall I have averaged 15. why is my upstairs neighbor so loud If you don't drive much, you might be eligible for cheaper car insurance. Also, keep the radiator clear of any blockages and obstructions. This tank came from the amex at Matty's place. cooling system. Drive in Economic/2WD Mode6 Duramax is equipped with 2WD and 4WD options. and would get about 600 miles out of tank of fuel. Aug 21, 2022 · Bad mileage after injectors. 6L L5P with 1200 total miles. The fuel pump moves the coolant fluid through the radiator and the engine. Take a quick read through our recommendations to squeeze every last ounce of MPG's you can out of your truck. I dont know where to go with this and im lost for ideas. I recently upgraded from a very tired 02 LB7 Dmax to a 2021 CC DRW. Because you are not required b. As a starting point, it's useful to understand typical gas mileage ranges that GM estimates for various Duramax trucks. Nov 29, 2012 · I am having terrible mileage on my 04 LLY. Everyone who drives a gasoline-powered ca. Verify with a scan tool or monitor. May 6, 2019 · Bad Oxygen Sensors and/or Air Filters. I have 12000 miles on it now and overall I have averaged 15. A few weeks back I checked it and was getting 14 Then it dropped to 13. I was getting about 18miles/gal and it has suddenly dropped to about 11miles/gal Truck seems to go as well as normal - every now and then it throws a. I been driving like a grandpa not heavy peddle at all and I can watch my fuel mileage drop insane I feel like I’m driving a 8 Jan 7, 2015 · I have a 2001 dodge 2500 5. Drive in Economic/2WD Mode6 Duramax is equipped with 2WD and 4WD options. So far I am less than impressed with the fuel mileage.