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Old 05-18-2004, 06:20 PM
Balthisar Balthisar is offline
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Join Date: Nov 2000
Location: Southeast Michigan, USA
Posts: 10,781
Originally Posted by Airman Doors, USAF
Those are for thermal efficiency, not combustion. The temperature of the forced air will have an effect on efficiency but little to no effect on detonation, which is what high-octane rated gas is designed to prevent.
That's something that he'd really have to check the owners' manual for. My car line had anti-knock sensors added/adjusted for the 2001 model year for this very reason. All the pre-2001 guys have to put in 93. I usually put in 87. The manufacturer recommends 93, but says only performance will suffer a little bit with the 87. Really, I don't notice any difference.