Choosing the right kind of gas for your car can save money (and optimize performance).
Regular vs super?
If an auto manufacturer does not recommend that you use supreme or premium fuel, there is no reason to. You are just wasting your money. If you are driving a European car that was designed to run on higher octane fuel then you should use it. Otherwise it makes no difference. Brand new supercharged jag use super. Prius does not care. In Europe they don’t even sell fuel oil as crappy as American regular. Those cars are designed with higher compression ratios and need the octane to prevent engine damage. Most other cars don’t so don’t waste the money unless it’s recommended by the manufacturer.