4.6 Fuel mileage?

I get average 21-24mpg, on the highway, I got 30mpg and that was highway only at 110km/h, I get around 450-500km/tank in mixed driving, but when I step on it then its a little different, I got 350 once with it, but at the time I was only using it during the weekends so I was driving it pretty hard.
 
i'm pretty much stock and i don't drive it to save mileage ;) . I get about 260 miles on about 13 gallons (~20-21mpg). my bf (stanglou) gets the same and he has pretty much every bolt-on and full exhaust. we both drive some highway and city. just hwy it's close to 23-25mpg.
 
On holidays this past summer, my G/F and I followed her parents out west, every time we stopped for gas, my Stang was 2-3 bucks cheaper to fill than her mom&dad's Concorde :D It made her dad cranky. :rlaugh: On the way home I was driving 80mph and they followed behind us and when we stopped for fuel, my G/F's dad said he'd fill my tank and I was to fill his, b/c he said I must be cheating and not filling mine all the way up. This time the Stang was just under $8 bucks cheaper. :D

Around town I'm sure his would be better, but on the highway the Stangs are pretty good.

Edit: I live in Canada and gas is about $4.00 a gallon, so it seems like more of a mileage difference than there really was.