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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 57 of 63

#557 of 620 more onfo by hillsdale56

Nov 24, 2010 (6:53 am)

Good morning everbody. Hey, I just took a look at powerup diesel . Biz. The tuner I bloged about is on sale for 427. Check the site out

#558 of 620 Chipped by jerrydock

Nov 29, 2010 (5:40 am)

I chopped my truck as soon as I got it. I can dial in economy or power. It saves my truck and my wallet. I suggest that the way the truck ahs been used and maintained is the most important thing to look at.

#559 of 620 d-max mileage by barrail

Dec 24, 2010 (8:45 am)

went to powerup diesel and bought their programer. noticeable throttle responce on the lowest setting, but do to the cold weather, can't determine if mileage has improved as of yet. I just want to make sure how everyone is determining their fuel mileage. Gallons in, divided into miles driven. Not what the DIC average tells you. EVERY one I ask how they determined their miles and they're to content with just using the drivers information center. So far, my best mileage has been 17.5 hiway staying under 70mph on flat terrain with the stock settings. Stay tuned to see if the programer improves mileage.

#560 of 620 d-max mileage by barrail

Dec 24, 2010 (8:46 am)

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

Dec 24, 2010 (11:52 am)

Replying to: barrail (Dec 24, 2010 8:45 am)
Hi everyone, merry chrismas to all. Glad to hear you have the programmer. Reprogram to the 60 hp setting. This is said to give best economy. Now a few facts about winter fuel. Where do you live? Is your fuel cut with kerosene? This is what is called 1d. Gives the fuel a higher cetane rating. Kerosene is 60. But lowers the btu of the fuel. You will get poor milage with this. Fuel quality varies from one pump. Brand and another. What year truck do you have, what gearing? Me I have 06 with 3.73 4wd. With the tune I have to drive In fifth gear. Get engine up to 1900 rpm. I'd say around 22, 23 mpg at 63 mph. As far as checking your milage, fill it to the top of the neck, drive and then recheck.

#562 of 620 Cold Air Intake problem by cbears85

Dec 27, 2010 (1:34 pm)

Hi all, I'm not sure this is the correct forum. I have a 2004 GMC Sierra 2500HD. I have an Afe cold air intake stage 2 system installed. I am constantly getting a "check engine" light on all the time. No matter what I do the "check engine" is usually on. I have tried cleaning the air filter but to no avail. Every once in awhile the "check engine" light will go off but only temporarily. As soon as I accelerate the light comes back on. Someone told me it could be the max air flow sensor that is mounted on the intake pipe that comes from the filter and goes to the engine. Does anyone know what causes the "check engine" to stay on and is there a permanent fix? It is driving me crazy. Any help would be greatly appreciated.

#563 of 620 Re: Cold Air Intake problem [cbears85] by coontie66

Dec 27, 2010 (1:50 pm)

Replying to: cbears85 (Dec 27, 2010 1:34 pm)
Exactly a year my check engine light on my 06 started coming on and never went off. Chev folks look at it 4 times or so and cleaned the turbo and other turbo related things until they replace it. Problem solved.
 
You need to put it on the computer and see what the error code is.

#564 of 620 Re: Cold Air Intake problem [cbears85] by kacansas06

Dec 27, 2010 (2:15 pm)

Replying to: cbears85 (Dec 27, 2010 1:34 pm)
I think you have messed with a complex computer system. It could be you have too much restriction. I know the people who sell those systems say they flow better but do they have as big a stake in it working correctly as GM. Check the package or web site it will basically say use at your own risk. My 06 filter seems to let nothing through for the passage behind it is very clean. Just checked it less than a month ago. I have replaced the filter 4 times so far. I can not imagine changing the intake setup without other major changes such as new higher flow turbo along with intercooler, piping, manifold and electronics changes. One can get slightly better power by reducing exhaust restrictions which also leads to cooler EGT temperatures. My Guess would be you are having EGT problems which can happen with too much air(runs lean) or too little. A diesel is a simple engine but made more complex be the turbo. Messing with intake can be a route to turbo failure.

#565 of 620 my take by hillsdale56

Dec 27, 2010 (2:33 pm)

I agree with the guy who told you to find out what code your getting. A thought I'm getting right now, clean your mass air flow sensor. Use either or carb cleaner. Engine OFF. SEE what happens

#566 of 620 Re: Cold Air Intake problem [kacansas06] by cbears85

Dec 28, 2010 (9:14 am)

Replying to: kacansas06 (Dec 27, 2010 2:15 pm)
Thank you very much for your input. My truck is not a diesel and does not have turbo. It has the 6.0L gas engine. With that in mind, I don't believe it is having EGT problems. Along with the Afe cold air intake, I also had dual Areo turbine mufflers installed. I don't know if that makes a difference or not. I guess I will need to get it on the computer to see what the error code is and then go from there. Again, thanks for you input and time.

Messages Page 57 of 63

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