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Show Motorists ask, 'Why the ping?' A query from motorists using unleaded gasoline often goes something like this: "When I use unleaded regular gasoline, why docs my new car knock and ping sometimes, and continue running after the key is turned off?" According to Amoco Oil Company, Com-pany, the question though a bit complicated is no problem to answer. It seems that in an effort to improve their cars' fuel economy econ-omy also required by federal law manufacturers have produced pro-duced engines that often crowd the octane satisfaction capability of unleaded regular gasoline. In fact. Amoco increased the octane level of lead-free Amoco gasoline since its introduction to help offset these effects. But after af-ter a new car has been driven several thousand miles, combustion combus-tion deposits build up inside the engine, increasing its octane requirement. re-quirement. Many other factors also affect the octane demand of a given engine, including slight variations in engine production tolerances. |