The last several cars I have had have all been Subies, and the thing is always on the passenger side. Every gas pump I can think of has two sides, so you just pull up to whatever side works for your car.
Now, I want to live where all you guys do where attendants pump the gas! I need to buy gas for the drive home from work today and currently it is 5 below zero out there. Brrr!
I remember cars that had them under the license plate, and it made me think of my first car, a VW bug. I can't remember where the fuel door was on that, but it was somewhere really weird - like in the front, I think? There in the trunk somewhere?