91 or 95 or 98 octane

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Yes - only used av-gas on my 1987 Honda Civic - 6 months after driving it off the show room floor - it was running 20psi boost / water-meth injection / turbo off a BMW 2002Tii / 17" mags / decompression plate between block & head (1/2mm) / dig bore dual tip exhaust.

And was clocked at 225km/h !!! (on track) - not bad for a 1300cc road legal everyday drive car....

Owned it for 12 years before I sold it to a work buddy......