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Originally Posted by FUHRIUS
I can only find 91 octane at chevron...though the books on the car suggest using 93 octane. anyone ever used an octane additive in the boxster?
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Don't bother with the "octane boosters". They don't boost it very much. Take a bottle that says Octane Booster 5 on it. The 5 is really only a .5 boost in octain for a lot of $$$ relatively.
Chevron gas runs better because of the Techron in it. It really does keep the system clean and keeps carbon from building up. I don't use it (get my gas at Krober), but we have 93 octane everywhere here and I drive my Porsches in the high RPM range which keeps the carbon from building up.