I just noticed my words being taken out of context:
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Originally Posted by E150GT
Who's to say his engine will not ping under use of regular fuel?
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I did
not even suggest that his engine wouldn't ping with regular fuel. Read again:
Quote:
Originally Posted by gmercoleza
...but only you can tell whether or not there is pinging as you drive.
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Quote:
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Originally Posted by gmercoleza
Failure to use 91 octane when the engine is not pinging will do absolutely no harm.
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Obviously if it starts pinging he should bump up the octane. Like I said, some people don't even know what pinging sounds like and wouldn't know whether or not their engine was doing it. This is why the manufacturer recommends 91 octane to be safe. But others have also stated that they run less than 91 octane and are not experiencing any maleffects.