I don't know about any of you guys but I have personally always beat the mileage ratings, usually by at least two MPG, and that is by calculation over several tankfuls, not using the vehicles computer, which usually says even a higher number than my calculations. So I usually figure if it says 23 mpg, I'm gonna get at least 25. For example with my 2008 Focus automatic I pull 38 on the hwy at a steady 70 mph and it's only rated at 33. The computer says I'm getting 39+ on the hwy.