In my area, Shell is a little difficult to find, Sunoco a bit easier. Shell is my primary choice, when I can get it. Wish we had Chevron in Pennsylvania, prefer their additive package. As I travel and have to make Toptier choices, I've also used Valero and Marathon. As long as it's on the list I printed from the Toptier site, I'm ok with it..Never tried anything other than 87 other than a tank of 89 Shell when they ran out if 87, no problems, but no difference in either performance or mileage. Never had a fuel or engine performance issue with any Toptier fuel, so I stick with them, nice that there's a standard you can count on, & no additives needed.Shell V-Power 91. It's also TopTier, as Honda recommends. Used that exclusively in my 2006 Acura TSX for the 11 years I had it, and not a single engine issue whatsoever, and never put any fuel additives in the tank either. The engine still purred the day I traded it in for the Civic.
MBN...... California 91 is the best we gotEvery full up other than what the dealer put in has been shell 93