I use anything that's the cheapestst at the moment. I usually, lately, get my fuel from Giant Eagle's station called GetGo; long story on the "scheme". Very rarely I get discount for Kroger fuel (Turkey Hill stations). I don't use Shell & BP because their price spread between regular and premium (93 octane around here) is very wide (50-60c/gal). Sometimes I buy Costco Premium when there are unusual situations.
I wish my Z could run E85, but that's a story for another time.
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