It wasn't a normal drive. Not only did I not fill up, but I didn't even leave the car. (Once I'd gone about 2/3s of the trip and realized it was maybe possible, it became sort of a challenge.) But yeah I've made that drive at least a half dozen times, but that was the only time I didn't fill up the tank.

In any case, my only point was that there are cars out there that can drive 500 miles on a single tank. The 9-3 I did it with is getting close to 20 years old. I'm sure there are older cars capable of the same.