Took Mine to North Carolina from pa about a 450 mile ride. Got 20.5 going there and 20.3 coming home cruise on just about the entire time except the 45 mph zones. Air conditioner on entire time and 4 passengers with bed completely loaded. I do have a tonneu cover and was running 36 psi did great i thought for all of the stuff in the back and 3.92 gears. I did the calculation rather then rely on the evic.