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yea NJ is wierd like that. but good thing you caught it. you should be ok if you filled up with 93 the rest of the way. 91 all the way and you'd have to dump the tank, if you are tuned for 93 only.
when i had my car tuned i was going to do a 91 tune as well, but my tuner wouldnt do it because of my compression.
91 octane is the premium fuel in some places. 87 and 89 for reg and mid is the same everywhere that i know of, with a few places like cali selling 91 instead of 93.