There's an ongoing debate about whether or not your car really needs premium gasoline (for which you pay premium prices). The American Automobile Association has done helpful research that says that, unless the car is built for premium gasoline, you don't need the more expensive fuel. It's a waste of your money. Apparently Americans collectively pay more than $2bn too much every year for premium gasoline our cars don't need.
But never mind that: the discussion around super unleaded masks a much bigger rip-off: the one you commit to when you buy your car.