You have to remember that the dealership put regular gas in your car when you bought it. I doubt that regular gas will mess up the car. Now if you have a turbo charger or supercharger, then that is a different story & you better go premium. Getting the middle grade is a joke & a waste of money. The reason is that you really have no idea if it is 1% better than regular, or a couple % lower that premium. Everytime you change your oil drop in an octane booster when you fill up your car.
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