Originally Posted by dcheatwood
Nephew had similar setup with 250 gasser. He claimed 7-8 mpg but complained of lack of power on hill climbs. Just traded back to 2500 duramax.
If you're going to be pulling on flat, level ground and only occasionally, then the gasser is the way to go. But don't expect much more than 7-9 when your pulling your rig. Hilly country will net you somewhere between 5-8, depending on what kind of speed you want to maintain.
I finally got tired of having to deal with all the limitations of my gasser and went diesel. Now I can pull whatever, wherever I want and still get 10-12mpg