Chevy Duramax Fuel mileage
I am looking for an honest answer from actual campers. I am considering buying a used 2005-2008 Chevy 2500 w/Duramax with a Alison Tranny to tow a 10,000 - 11,000 Fifth Wheel. Those of you that have a...
Forum Discussion
AZ T&T wrote:pressure_welder wrote:
I have a 2012 denali dually dmax/allison. Love it to death, before i did the full H&S delete w/ 4" dual exhaust i would average 15-17MPG max due to the regens, and about 9-10MPG towing. Did the full delete and no word of a lie got a hand calculated 24.6MPG highway on a night drive with zero wind with the cruise set at 100km/h so that was a picture perfect "ideal situation" but in a real world day to day i get about 18-20.
Are you worried about the full delete affecting your warranty? I would love to use a programmer but I would hate to do anything to void the 100k power train warranty. Also in AZ we have emissions testing and I wonder if it would have a negative impact on that?
Fortunately i am in Canada and we dont have emissions testing thus far so were good in that regard. As far as warrenty goes its kind of a long story but basically my father inlaw is in heavy construction and between him and myself we have 5 denali LML duramax's in the family, everything was good with them until the winter and boom! MAJOR DEF fluid issues to the point of where he had to ship a few trucks out for repairs multiple times which as you can imagine is BIG bucks for someone in business, SO he literally had 5 custom built Cummins engines to drop in the GMC's just about ordered until i told him about H&S, and it wasnt 2 weeks later and all of our trucks were deleted and running one million times better. Our dealer who is the dealer principal worked with us and is still honouring our warrenty due to our excessive issues with the DEF fluid in the winter and other affiliated DEF problems. Mostly because he knows our driving style and we drive respectably and arent in it for the HP gains, also i would imagine the fact that my father inlaw in the past 5-10 years has bought well over half a mil in trucks from him. The dealer knows we just simply wanted to delete the emissions crap. And running the tow tune "50HP extra" wont hurt the truck in any way provided your not trying to race everyone you see.
