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Old 07-30-2002, 04:19 PM
Posts: n/a
In the past couple of years, I have become a big believer in those synthetic fuel system cleaners, they really have made a difference in the smoothness of my Jaguar, and seem to help the fuel mileage on the other cars as well.

Lower octane fuel will make the engine more susceptible to knock, but FYI for others with the same problem I do not know any way it would cause a rough idle. Usually, idling is smoother with lower octane fuel.
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