Quote:
Originally Posted by Wonderboy
Could you explain the risk of knock/ping involved with using regular octane gas? Should I consider using 91?
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In the case of your '98 Civic EX, if pinging begins to occur it will immediately be detected by the anti-knock sensor (think they became common about same time as ODBII was introduced) and the ECU will automatically adjust ignition timing to avoid knock/ping.
If that's the case you'd get somewhat better mpg with 91 octane, but whether the improvement would be justified by the increase in price is doubtful.