I am definately a left lane driver mabey not 100 but few people ever pass me. I don't think in town mpg will be any worse than my old dart was with 2.45s with it's open chamber low compresion heads and a carb. I am not much of a jack-rabbit in the truck because stuff would roll all over in there and spill... but I will roll on down the highway a lot and um right up to but never over the limit