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[quote="dabimf"That being said, I know that in cars where premium gas is required, one can use 87 octane fuel in the same vehicle. These vehicles are equipped with engine knock sensors. These sensors detect engine knock that you can not hear. When the engine knock is detected the sensors cause the ignition timing to retard slightly to prevent the engine knock. This in turn will lower engine performance slightly. The vehicle will run but not at peak performance.Hope this helps a bit.[/quote]

The knock sensors will not always stop knocking. On a hot day my 2002 Miata will still knock under heavy loads with 87 octane.
 
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