Luke(MI)
Blow Smoke
8.1 is a doggy low rpm torque motor. It isnt meant to go fast its meant for brute strength, and thats what it does. Its almost as heavy if not as heavy as a duramax at 2/3rd the power and 1/8th the fuel milage. If your pulling 15k lbs to town a coupletimes a year go for it. If you want to take a 35 foot toy hauler camper to the virginia mountains get a duramax. If you want to lay down impressive numbers at the track 6.0 swap. but if you go 8.1 have fun getting 8-9 mpg though