From what i have seen from most people here they are 8.5-9 weather ut is gas or diesel. The big difference is the city driving with the diesel. With the 6.2, you can only expect about 11-12 at the most and 14-15 on the highway with good weather and little hills. The 6.2 can tow anything and does a good job of it. You dont lose very much in towing weight with gas vs the diesel, the trucks are built with the same parts and the inly differnce is what under the hood. You will like the 6.2 and will have no prolem towing your trailer.