Oh, I'll have to change my habits... Exxon (93 Octane) tops my tank because they are the most convenient and (locally) happen to be less expensive on all grades. But they're not on the list... I'll have to hit up the local Texaco or find a Shell station.
Any top tier gas works for me. I buy Chevron premium 99% of the time. I like the additive Chevron puts into their gasoline. There is a Costco near me that sells gas usually .20/gal. cheaper but they use Astro gasoline, not a top tier gas. I bought their gas only once.