If I didn't have 15K lb. fith wheel to tow or got a smaller trailer I'd trade my 4X4 powerstroke diesel for a 1/2 ton gas truck in a heartbeat. The only time I get better milage than a gas rig would is when I'm hauling the fith wheel. When I bought the truck and trailer (2007) diesel was averaging 50 cents per gallon cheaper than gas, now it's .50 higher. The extra milage doesn't offset the increased cost but I need the the pulling power in the mountains.