Ok sorry, I drive with 2 adults in the car not towing anything. 95% is Highway 70-75 mph. And the road I live on speed limit is 55mph so I still do 60-65. And any other road would be 30 and I do 30 (speed Traps..LOL ) I use 91 octain for gas. If I use 93 will I get better gas mileage? Tryed it twice back to back and same gas mileage..I did get 55 mpg once. (Going down a long long hill .