Definately the diesel is better for towing but, I don't seem to get any better mileage with my 6.4 tuned or stock than you guys are saying your getting with your 6.2. Tuned I get 16.5-17 @60mph. and 13-14 driving around town if you take it real easy. At 70 I'm getting around 15mpg. Stock these numbers were even less, I think 15 is the best I ever got stock and towing my 24' haulmark trailer I got 8.5-9.5. I'm looking forward to paying .40 cents a gallon less for gas when my new truck gets here!