Quote Originally Posted by skrRecycling View Post
I always look for a tractor trailer to draft behind . I use a 04 GMC Sierra 1500 to go back and forth from the house to the shop(84 mile round trip) truck is all stock, gets 20/22mpg if you keep it at 65mph, runs around 1800rpm. If i draft behind a tractor trailer i can drop my rpm to 1550 and still keep it at 65mph.
Describe to me how a fixed thing like rotations per minute changes?
Should not happen with a lock up torque converter