2004.5+ LLY Duramax Fuel Economy Poll

[kantra]

I have only 750 miles on miy 6.6 and it gets 15.2 per gallon and 11.4 towing my fifth wheel camper 13000lbs I figure that is not bad for an engine not even broken it yet

[kantra]

With 1000 miles on my truck I pulled my 14000lb fifth wheel home the other day not knowing the truck was in 4 high when I checked my milage it was 14.4. But in 2 wheel drive its only 11.3 what gives with this??

[Chuck1]

I have been getting 20 to 22 mpg highway and with my 5th on 15 .Its only a 25footer and i can hardly tell its on there .Man I love this truck .I had a 6.5 before this for 10 years never had a problem did a few adds. thermestat high out put water pump and fan I never had it overheat and i live in some major mountians,I tow quite a bit flat deck trailers and my 5th but after reading about it here. I thought best to do the cooling mods. It was a good truck also when I sold it the buyer said what dosn't work on it ? It was a 94 and had a full load and I thought for a minute and realized every thing worked and had never given me a problem.It was a little slower up the hills than the dmax but a really good truck.If my 05 dmax treats me near as well I.ll be happy. And boy with the extra power and the heated seats I'm in heaven !