My '97 SL2 has the locking gas cap on the driver's side.
I was at the showroom yesterday to see all models with the unlocked gas cap on the passenger side.
I asked the salesman and he told me that the reason is that if you pull of the road on the right, it is safer to add emergency fuel.
But the problem is that if you're on the highway and in the left lane, you can pull off to the left shoulder and thus, if the gas cap is on the passenger side, you expose yourself to oncoming traffic.
I hate the fact that all current and future models are based on that.
I may have to choose another brand when I'm ready to shop for a new car.
Saturn should have put the gas cap on the rear center, so you can fuel from a neutral zone.