Duramax economy 3/4 ton

Running 65 on the highway not pulling I get about 19.5 mpg average. In town

10 - 12 mpg , not pulling.

I'll guess about 14 -15 mpg with 8,500 lbs on the highway if you dont push the speed too much. In town, mileage isnt going to be anything to brag about.

I don't tow a trailer of the same weight, but I can give you the figures I have. My truck is a 2004 Chevy 2500HD Crewcab with the Duramax diesel and the Allison tranny (3.73 rear axle). I have made no significant engine modifications with the exception of adding on an auxillary Racor 2 micron fuel filter.

**City with no load (daily driving) - 18.5mpg, this number is consistantly predictable every time I fill up. **Highway with no load (70mph) - 21mpg, but mileage drops when over 75mph. I suspect that if I could measure it on a longer trip with greater periods of constant 70mph it would increase over the 21mpg figure. **Highway with 3000# (camper and gear, 70mph) - 17.5mpg, and I won't pull my camper any faster.

Recently been to Savannah, GA and back from central Florida so I had a good opportunity to measure my mileage.

Cheers - Jonathan