Most cars and I would even say about 99% of cars will run just fine on regular unleaded gasoline for THEY WERE BUILT that way. In this financial crisis, I would say that to use premium gas is more a luxury than a necessity.
I try not to switch brands OR grades of gasoline. It does make a difference if you switch off. They add different additives and detergents to each brand of gas so you do erode the seals and gaskets quicker if you use something different. However, I've always used regular without any problem.
Keep using whatever your car is used to, and it will keep running good. I've heard that premium has additives in it that help keep your injectors clean. I don't know if that's true though.
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