He is correct, we have the same problem here in Cali. There is a additive that is added to our gas that is to bring down emissions(dought it works) required by our state government. This additive brought us down last year from 92 to now 91 and the only way to fix it is to put a octane boost in or race fuel from 76. You may also want to get your chip reburned for the new octane you will be running on a day to day basis or gas will get very expensive for you, around here race gas cost about $4.99 a gal. not sure in your area though?
damn that just sucks...i dont know how you guys do it.....when i was living in texas and tennessee we got 93 octane for the same price as 91 out here....there is only one station that sells race gas in tucson....maybe i wont be hitting boost for the 5 months i'm here!!