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Pickups Diesels Chevy Silverado and GMC Sierra Duramax Fuel Mileage
506 messages, Last post on Nov 30, 2009 at 5:21 PM
You are in the Diesels Forum. Your Host is kcram
i bought my 06 duamax used with 30000 miles on it. the truck has striaght pipe all the way. It has no cat and no muffler. Is this good or bad for the engine? Does it need a muffler?
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My '07 GMC Duramax w/ 15k miles gets a dismal 13.7 mpg max. It doesn't seem to matter if I am driving in town or on the highway. If I'm towing my 2 horse BP trailer, it goes down to 11 mpg. Poor MPG while towing doesn't concern me as much as the absolutely awful fuel mileage on average. My [now probably in Mexico because it was stolen] '03 F-250 got 18-22, so this was a bit of a shock. I waited not-so-patiently for the engine to get a few thousand miles on it, thinking the mpg would improve, but it hasn't. With diesel prices at this hour $4.68/gal. here in the SW part of NM, I would like any input on how to improve my MPG without voiding my warranty. I've read on here about something called K & N air filters and a product called Diesel Kleen. Any advice/comments about these? Can the dealer put on the new K & N if I wanted it? I live in a very small town with very limited resources for any work done on the truck. [Think WalMart only.] Also, I put Michelin LTX M/S 265/75R16 tires on it because the tires that came with it were wimpy street tires and couldn't navigate the mud and snow here. Is there any way to tell if the tire shop recalibrated the computer? If not, can the dealer do this? Oh yeah, I'm a woman if that matters, so please respond in language that I can understand. LOL. |
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Hi, I found this forum a few days ago and have read a lot of good information and tips. There are several messages where folks are saying their 06 2500HD or earlier duramax (after break in) are getting 20-24 mpg highway. Can anyone tell me how the new 08's compare on mpg? I've heard with the new emissions that went on in 07 that the mpg's took a hit. Did they? If so, how much? The couple folks I've talked with, that are complaining about the poor mpg, drive with a heavy foot so I don't know if this is true or if it's their driving style. I've been saving for a while waiting to move up to a 2500HD duramax. Are the new 08's good or should I be looking for a used? Thanks, JT |
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Replying to: jtoc (Jun 08, 2008 4:23 pm)
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Replying to: agman57 (Jun 12, 2008 7:57 pm) Thanks for the info. 8.5-13.5 is the range I've been hearing which is really unacceptable considering what is was. What are these companies thinking? Thanks, JT |
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| I have a 07 with a work tuck bed, and im stock and getting 11 mpg in town and 13 on the highway. It's 4x4 also. I really would like to get better mileage ! Would a programmer help or hurt | |
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What is the my best op for this truck ? Is a programmer good or bad, will it void the warranty?. It also has a work truck bed on it, I was going to remove the rack for better mileage since we dont use it for pipe.
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Replying to: 1sierraman (Jun 16, 2008 3:36 pm) |
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Replying to: 06duramax (Jun 05, 2008 6:12 pm) My 06 Liberty CRD is a straight pipe and the faster spooling of the turbo is very noticeable. The louder sound turns heads for the little 4 cylinder sounds like a V8 at WOT. |
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