Some little know facts about the gas door:
1)just about every car has an arrow on the gas gauge pointing to te side of the car the filler is on, so look for that if you're in an unfamiliar car or just forget. The BRZ has it as you can see in this photo (little arrow next to the fuel pump)
2)the hoses on the pumps are long enough to reach both sides of the car, so there's no reason to spin your car around if you end up on the wrong side. Just pull the hose over.