Which engine is Cooler?

well my 06 ram with 5.9 cummins in it weighed in at 9000 pounds and it would get near 23 mpg on the highway driving 65 mph. this truck was four wheel drive. now with your truck two wheel drive you can tune it get even better fuel milage all kinds of horse power and torque. now it is not as much of a wow to have a diesel in a truck but when you line it up on the street and your truck kicks a lot of but