Chevron or Shell. I ONLY use Chevron because it has Techtron in it which is suposed to help keep your engine clean. Shell gas has something very similar. Another version of the same type of additive. Either one of those gas companies would be a good choice.
I only use 93 Chevron or Shell. When I lived in CA mostly Chevron, now that I'm back in NY mostly Shell. In CA the highest Octane for both brands was 91. The compression ratios for these engines demand the higher octane. In my Yukon I run Shell 89 even though it can run on 87.
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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.