Everyone must buy and use high octane. It is better for your engine and will increase gas mileage. You also will not have to change your oil as often and the air in your tires will not need to be rotated nearly as often. Only about every ten thousand miles or so.
I owned a Texaco several years ago and believe me, all my customers needed premium.
Seriously, though, my station was not in the best part of town and I sold a butt load of premium as a percentage compared to other owners in more affluent neighborhoods. Go figure...
Black Lingenfelter Lux