Originally Posted by CuttingEdgeLandscapes
We run one gasser for mowing and it averages 6.5 mpg. But pulling with my '01 duramax I average around 22mpg with a 20' enclosed trailer. The repairs are usually a little more expensive but in the long run the extra money is worth it when you're getting 500k+ miles out of a truck. Even just doing estimates the mileage is at least mid 20's. I believe diesel is the way to go
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I do not think you will get that kind of mileage out of a late model with all the emissions on them. I could be wrong.
On the NPRs I am told to expect about 1 MPG better with the diesel.