Quote:
Originally Posted by USA-RET
Yep. You should be @ 89 octane even w/ your mistake. My dealer told me it's okay to run mid-grade in the car, but mine has seen nothing less than 93 octane since owing. Plenty of debate among owners that opt for the 89 vs the 91 w/ no ill effects reported..
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There is some regulatory reason why CA refineries are limited to 91 and CA supplies most of the SW. So 91 is the best you can buy unless you go for racing fuel. Then there are some high altitude refineries in the Rockies that sell 85 octane as "regular" because of the thin air.