Figure out your MPG. I get about the same amount of miles to a tank. I figure out my MPG everytime I fill up, normal driving (for me anyways) gets around 24mpg for mixed driving. If I have a lot of highway miles it goes way up. I remember one time I went out to the desert and back one night, 160miles, and gas gauge was still a little above the halfway mark. But once I put some city miles on it it balanced out and I turned out getting 28-29mpg for the whole tank.