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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.- Your Host is kcram
What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck
#618 of 620 Re: 2009 Duramax 2500 [kacansas06] by coontie66
Dec 10, 2012 (7:02 am)
Replying to: kacansas06 (Dec 03, 2012 4:01 pm)
I have the same story with my 06Chevy 2500 diesel. Slow down , IT really does improve mileage.
#619 of 620 Re: DURAMAX FUEL MILEAGE [blackmax] by joemagic
Dec 15, 2012 (11:13 am)
Replying to: blackmax (Sep 19, 2004 2:26 pm)
The toneau cover actually reduced your gas mileage. Myth busters on the discovery channel actually showed how a mini vortex make circles in the open bed of a truck with the tail gate UP actually has better aerodynamics than either a tailgate left down or a cover. Look it up.
- kacansas06 (Dec 15, 2012 3:45 pm)
Replies to this message:
#620 of 620 Re: DURAMAX FUEL MILEAGE [joemagic] by kacansas06
Dec 15, 2012 (3:45 pm)
Replying to: joemagic (Dec 15, 2012 11:13 am)
You are correct. All one has to do is watch those covers as they go down a highway alongside your truck, always having ripples and bulges in it and it gets worse as you go faster. I think in that Myth busters the only thing they found that increased mileage on a bed was a full topper but it had to be the correct shape, I think made out of fiberglass. The metal ones don't help. My hard fiberglass deck lid which is not high enough to reduce drag actually lowered my mileage by around 1.5-2mpg.
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