Big ol' bank of gas pumps, gleaming in the lights surrounded by desert air. This is about your last stop for gasoline if you're headed to the 60 and don't want to be bothered to fill up until you're out of town.
If you're headed off of the 60, there are closer gas stations to the Mesa Gateway airport (think: rental car gas tank top-offs) but this one is as good as any of them.
I never went in the building, but when you've got that many pumps and you're in and out of there in under 5 minutes, why bother? Unless you're after the junk food. And then, presumably, you've got your QT full of junk just a few steps away from the gasoline.