NEVER shell. it made my jeep unhappy, hurt my old scirocco, and i think a buddy put it in my truck recently, when he borrowed it, and 1/2 way though the tank, I knew it wasn't chevron, cause the mileage sucked.
I use Shell V-Power 93 Octane here in New York. When I lived in CA it was Chevron or Shell in that preference order. But in California the max Octane was only 91 if my memory is right.
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2000 Boxster S: 18" Turbo wheels w/color crests, Litronics, Onboard Computer, Traction control, Cruise, Painted rollbar, Leather interior, Aluminum package, headlight washers, Porsche GT3 seats, windstop, Hi Fi six speaker amp package, DSP, CDR 220, Limited Slip, side airbags, BK Rollbar extender.