I have a good friend that has a 07 hemi he tows a small travel trailer with it and he is getting somewhere around 10mpg and my 06 TCD was getting 15 pulling a 32'enclosed tag race trailer with 1' extra height.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4