every time I fill up my car, I suspect all the different octane gasoline are exactly the same, 91 octane. The only difference is what it is called (eg. gold) and the price. Gas company puts in the same octane gas, with a little advertising, gets more money by calling it gold or premium plus. It is all marketing. Unsuspecting driver feels better buying higher price gas for their beloved car. Any one likes to comment.
