I could probably push it to almost 475-500 if I wanted to go until the car sputtered, but that's really bad for your car, so I'd rather not find out.
I've gone as far as 400-ish (don't remember the exact number now, but it was right around 400 miles) on 11 gallons before I refueled. That was highway cruise @ 90mph, no speed variation, with the aircon on.
