lindseylou2290 - 2014-01-28 8:37 AM I suggest looking at your set up. Where do you haul the most often (mountains or mostly flat lands), how heavy is your load, the size of your trailer, etc. Growing up, we showed livestock and crossed the Rockies often, there was no way we were going to pull a double decked 20 ft trailer full of stock, tack, feed, our stuff, etc without doing serious work on a gas engine. We did pull with a standard transmission gas 6.0 GMC, but honestly, it didn't end well for the truck. Changing to an allison tranny Duramax, there was a significant difference in mileage, power, and upkeep on the truck but it was a better haul for us as a whole. Granted we were pulling large, heavy loads up and down mountains in a 1 ton dually. I now pull, depending on the load and the trailer, with either a gas Chevy half ton or a diesel Dodge 1 ton dually. It depends what I'm pulling, where I'm going, and how far. Definitely evaluate your situation and your needs ... you may not need a diesel.