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<p>heated by compression. Gasoline engines rely on ignition of compressed <a href="page.php?w=air-fuel_ratio">air and fuel</a> mixture, which is ignited only near the end of the compression <a href="page.php?w=stroke_%28engine%29">stroke</a> by electric <a href="page.php?w=spark_plug">spark plug</a>s. Therefore, being able to compress the air/fuel mixture without causing detonation is important mainly for gasoline engines. Using gasoline with lower octane than an engine is built for may cause engine knocking and/or <a href="page.php?w=pre-ignition">pre-ignition</a>.</p><p>
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