Whats the absolute worst gas mileage you've ever gotten in your stang, for whatever reason? Doesn't matter if it's 100% city or what. Lets just see the numbers (and your mods if they're not in your sig). 100% city, driving like a maniac, I got 8mpg about a month ago. Though even driving very conservatively in the city, I can't do much better than 13. Its not until I hit the highway for long periods of time that I get in the upper teens, low 20's.