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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

620 messages,  Last post on Dec 15, 2012 at 3:45 PM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

Messages Page 58 of 62

#571 of 620 Re: d-max mileage [barrail] by hillsdale56

Jan 07, 2011 (7:42 am)

Replying to: barrail (Jan 07, 2011 6:03 am)
Hey what's up? What you read is true. When diesel domination reprograms the ecm, it brings the max torque to 1900~ 2000 rpm. I have 373 also. My engine runs around. 63 mph. The engine runs stronger in fifth now. The easy tuner has a feature to monitor engine performance. That is sure way to tell. I have to have someone with me to watch the screen and see where the highest turbo boost is. I will post a thread when I do this

#572 of 620 Re: DURAMAX FUEL MILEAGE [gagrice] by keygmc

Jan 20, 2011 (2:11 am)

Replying to: gagrice (Sep 19, 2004 3:01 pm)
I Have Solved my mileage problems on my 2008 duramax crew cab 4x4. I was getting 14.7 MPG . I did some research and found that in order for GM to meet the new emission standards they installed a particulate filter in the exhaust. This filter has fuel injected directly into the exhaust for it to work. This results in clean exhaust and poor fuel mileage. Now for the solution. I ordered a tuner the brand is H&S this tuner has a dpf ( Diesel Particulate Filter ) Delete which will allow you to replace the entire exhaust system from the turbo back and not set any codes in the ECM. I installed a new 4" exhaust and cold air intake system ( Banks ) . I could not believe the difference. The H&S system has 4 different power levels I rum on the hot or highest power level for best milage. I am now getting 20.2 MPG around town and 26.1 Mpg Highway.
I used to have the bully dog tuner on this truck with no milage improvement but good power but with these mods. This truck is pure mean I recomend everyone make these mods. It cost me about $1,200.00 for the tuner and exhaust. Well worth it especialy when I can out run just about any car or truck on the road.

#573 of 620 Re: DURAMAX FUEL MILEAGE [keygmc] by hillsdale56

Jan 21, 2011 (11:43 am)

Replying to: keygmc (Jan 20, 2011 2:11 am)
Glad to read about your good results. Right now I have a half a ton of wood in the back of my ride. With all the snow we are getting here in new york, I'll. Never get stuck. But its killing my city fuel economy. Stay warm

#574 of 620 Re: DURAMAX FUEL MILEAGE [keygmc] by fueledup

Jan 27, 2011 (3:33 pm)

Replying to: keygmc (Jan 20, 2011 2:11 am)
I'm real interested in the results you experienced with the H&S tuner. I to have a 2008 2500 duramax that averages around 14 mpg. Which exact set up did you purchase ? Whats involved with the installation? How many miles have you driven with the new tuner? Are you precise with your mileage estimates? What are you getting city and highway? Thanks for your response.

#575 of 620 $4.00 diesel fuel by kacansas06

Feb 10, 2011 (1:32 pm)

With this price just over the horizon again, like back in '08, I know that I can drive my '06 Duramax diesel for much better than the 18 mpg I have been accepting for quite awhile. All I have to do is slow down my acceleration after 30 mph and drive at 55 mph as much as I can. People have short memories but I can say that back in '06 to late '08 drivers of all kinds of vehicles did slow down and did save money. I would expect that driving 15 mph slower will result in a mileage increase of 6 to 7 mpg highway and 5 to 7 mpg city. This is all based on my '06 Duramax results over the last 5 years. I have always tried to drive for better mileage since fuel has rarely been below $3.00/ gallon since I have owned the truck.

#576 of 620 Re: DURAMAX FUEL MILEAGE [fueledup] by hillsdale56

Feb 23, 2011 (7:04 am)

Replying to: fueledup (Jan 27, 2011 3:33 pm)
Hi, sorry it has taken me so long to get back to you. We are all feeling the pain at the pump. The mideast is in flames and oil has gone over 100 dollars a barrel. Know the name denise rich ? One of bill clintons inner circle. Her x husband marc rich is the one who put crude oil on the comodities market. The real reason I wanted to answer you is this. Remember my last post I said the wood I was driving around with for almost a month was killing my fuel economy?. Wasn't the wood. It was number 1 diesel. With this winter we have had. They have put a lot of kerosene in the fuel. When it hits 5 bucks a gallon, buy that time we will switch back too 2d . It was 8 degrees in upstate ny, last Sunday morning. What a winter!

#577 of 620 d-max fuel mileage by barrail

Feb 23, 2011 (7:33 am)

The tip about getting the engine to run at 180 degrees made a little difference in the trucks mileage. If nothing else, the cab warmed up sooner. Bottom line, if you want better mileage, stay off the throttle. I presently have the easy tuner set at 80 e. at the engine responce is very noticible. Fun to drive. Doing more highway driving now, but the mileage still is not 20 mph. stay tuned and thanks for all your input.

#578 of 620 Bad Mileage, Bad Power Towing... Dealer Diesel Mechanic won't help by c_coggins

Feb 28, 2011 (7:16 am)

Interesting reading...
 
Our '07 2500 Classic is great but for the mileage... avg. 13 mostly hwy and between 9-11 towing a tiny little 2 horse bumper pull with 2 ponies! Grrr. It's got 55K miles and has been well maintained.
 
My old '03 Duramax got 21 hwy 17 city... and towing got around 16 pulling a bigger trailer with bigger horses. I was hoping to get the same or better.
 
When I did the research before I bought this truck, all said the mileage was similar to the '03... now I see these threads and wonder what's going on?
 
 Is anyone out there getting good mileage at all? If so, enlighten us!

#579 of 620 Help my milage by rgferri

Mar 02, 2011 (8:47 pm)

I have a 2006 2500hd crew cab with a 3.73. i was wondering if anyone has some advice for better milage. right now im getting about 11 in the city. was driving a 2004 sierra 2500 and getting 17.5 in city. both truck are bone stock. any pointers?? thanks!!!!

#580 of 620 Re: Help my milage [rgferri] by kacansas06

Mar 03, 2011 (1:07 am)

Replying to: rgferri (Mar 02, 2011 8:47 pm)
first question: is it a diesel??? If not that is about the best you are going to get. Crew cabs weigh a lot more. If it is a diesel then I recommend you decide if you like the acceleration more than mileage. Take it easy on the diesel and you will get better mileage. If that doesn't work then the next easy step is disconnect the batteries, causing a transmission computer reset and then drive it easy. The Allison tranny behind the Duramax is a learning computer for shift points and the more hard acceleration the less up shift and fuel savings. Also the faster you drive the less fuel savings from the engine computer and tranny computer. An '06 diesel is the best one GM has produced lately for mileage.

Messages Page 58 of 62

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