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Originally Posted by A1337STI
the owners manual for my 2005 STI says you should use 93 or Higher octane. but it also says that above 1500 feet 91 is okay.
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91 is "okay" at sea level too, you just lose a little bit of power and knock protection. Car won't blow up without mechanical issues though.
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Originally Posted by A1337STI
so basically all gas in the same state are the same,
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Nope. There's more to gas than octane, but even that typically differes from state to state.
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Originally Posted by A1337STI
But does each state does have different additive requirements right ? IIRC California used to require MTBE , but in 1999 now stations that have MTBE have to be labeled as such. and IIRC Tahoe won't allow that in any gas , (so i'de guess all tahoe stations get a different blend, and/or only use the nevada side blend, but i'm guessing )
I do know they all have signs saying they are MTBE Free .
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California "banned" MTBE after being the only state requiring its use as an oxygenate because it turned out it was doing less good for the air than harm to groundwater. It's not in any fuel now, and Tahoe stations got it when it was.
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Originally Posted by A1337STI
Should i try to only fill up on the NV side ? or fill up on the Cali side ? There's 2 stations on the cali side that have 1 nozzle per octane, where as on the NV side its 1 nozzle for all 3 octane ratings.
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It's the same formulation, only changes for altitude. So if you fill up above 3000' or so you're good to go. Personally, I think the seperate nozzle thing is overrated.