Quote:
Originally Posted by sonick
Depends on the car, if it's newer it should have knock sensors and the technology to retard timing to prevent pre-detonation from occurring.
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Quote:
Originally Posted by SumAznGuy
It's a shame. With the current high fuel prices, some people are cheaping out on gas thinking the knock sensor will retard the timing enough to run the car safely on 87 octane.
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That's the problem. Depending on how far back the car is programmed to retard the timing, it may not be enough to prevent detonation.
Especially if the car is designed to run on 91 octane and the owner uses 87 for an extended period of time.