i get the same amount of gas mileage. if you're using the whole tank (I mean the WHOLE tank...people don't usually run it THAT low), then you're right, ur not gettin the right amount of mpg. but if you run it until u have about a quarter of a tank left, then fill it again, then u ARE gettin the amount of gas mileage that integras usually get. don't mean to rain on ur parade, but i end up spending anywhere from 40-60 dollars on gas a week as well, from work to home, from home to work, running around, etc.