Well premium is a ploy my the oil marketing companies. Even the name “premium” is part of the game.
They infer, in every way possible that “premium” is “better” than regular. However premium in a car that does not need it is at best a waste of money. How many times have you seen tthe adds that infer that premium has more power or will give better mileage (in all gasoline cars) than regular?
Premium is the right choice for those cars that need it or can take advantage of it, but it is a total waste of money for all the rest of the cars on the road.