All depends on what your towing and how much. I absolutely love my 2011 chevy duramax 3500. It pulls my 12k 5th wheel with ease and gets just under 12mpg doing it. But 3 trips to the dealer in the past couple weeks has me nervous. Two of the trip were related to the DEF system. Which gas trucks don't have. I am beginning to think maybe gas is better considering the cost and complexity of the diesel motors today. But if money was no issue I would choose a diesel every time.