A magazine, either car and driver or motortrend, I dont remember which, did a test comparing how different vehicles performed using various grades of gas. The cars tested ranged from honda accords to m3s. The cars were fed 87 for two weeks and then dyno tested, and then switched to 93 and dynoed again 2 weeks later. With the exception of one car, they all performed better with the higher octane. The accord did better with 87, but even honda admitted that it was probably a fluke, and the minium the accord should have is 89. The article also discusses how even if a car needs to run 91, as it ages it is better to upgrade to 93 to compensate for wear.
In sum, 93 is the best, and should be had all the time, espcially if you have high miles.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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