I've had both Hemi and CTD. I love the CTD more, I was towing my buddy's '65 Olds Cutlass and getting 13mpg and it pulled without any effort, my old '03 2500 4x4 long bed Hemi got 11 around town. Put trailer on Hemi and max was 10mpg. Btw, I want the shirt, 3XL please. Will be towing my 2002 6500lb 25' Nomad 250LT trailer to Yosemite in 2 weeks, I'm actually looking forward to putting this thing to work :-laf .