Quote:
Originally Posted by tigermack
That's the Sunol station. I don't think higher octane helps unless you have a tune that can run the higher octane.
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Quote:
Originally Posted by PMok
actually 94 octane does help... I don't know if the FR-S manual says it, but there is a place in the BRZ owner's manual (p. 420) that says:
So it is basically saying that if you run 91octane it's "ok" but 93 is best and what the engine is designed for.
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Yup, like P said, our cars are designed for the higher octane, but I think if you've been filling up with the standard 91, your car already has made adjustments (ie pulling bacj the timing, etc) to optimize itself/compensate for the crappy fuel. I would guess you would need a couple of tanks of 93 for the ecu to readjust to feel any difference.