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northerngmc · 03-08-2007, 11:32 AM

I have an 04 2500HD,Crew Cab, 4X4, regular box (6.5ft), duramax with the allison auto and the Edge EZ power module (which I leave set on #1, which Edge claims is the 'mileage' setting).

I am in Canada, so I am using imperial gallons, but in the summer driving 75 mph down the highway on a long trip I will get 21-22 mpg (18-19 in US gallon).

There is a big difference between summer and winter diesel so my winter fuel mileage drops 10% or more.

Last summer I towed my 31 ft travel trailer from Edmonton AB to Vancouver BC, which is over/through the mountains. Pulling the trailer I go slower, maybe 60 mph, and I was able to get 16 mpg.

The power is wonderful and the mileage is a real bonus. Just to compare, my brother had a 04 2500, extended cab, long box, 4X4 with the 6.0 gas engine. Simliar highway conditions and he would get 14 mpg to my 21 mpg.

But you can buy a lot of gas for the $10,000 price tag of the duramax/allison.

03-08-2007, 11:32 AM	#2
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Duramax gas mileage I have an 04 2500HD,Crew Cab, 4X4, regular box (6.5ft), duramax with the allison auto and the Edge EZ power module (which I leave set on #1, which Edge claims is the 'mileage' setting). I am in Canada, so I am using imperial gallons, but in the summer driving 75 mph down the highway on a long trip I will get 21-22 mpg (18-19 in US gallon). There is a big difference between summer and winter diesel so my winter fuel mileage drops 10% or more. Last summer I towed my 31 ft travel trailer from Edmonton AB to Vancouver BC, which is over/through the mountains. Pulling the trailer I go slower, maybe 60 mph, and I was able to get 16 mpg. The power is wonderful and the mileage is a real bonus. Just to compare, my brother had a 04 2500, extended cab, long box, 4X4 with the 6.0 gas engine. Simliar highway conditions and he would get 14 mpg to my 21 mpg. But you can buy a lot of gas for the $10,000 price tag of the duramax/allison. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!