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The term spark-ignition is normally used to refer to internal combustion engines where the fuel-air mixture is ignited with a spark. The term contrasts with compression-ignition engines, where the heat from compression alone ignites the mixture. Spark-ignition engines can be either two-stroke or four-stroke, and are commonly referred to as "gasoline engines" in America and "petrol engines" in Britian. However, these terms are not preferred, since spark-ignition engines can (and increasingly are) run on fuels other than gasoline, such as autogas (LPG), methanol, ethanol, compressed natural gas (CNG), hydrogen, and (in drag racing) nitromethane. A four-stroke spark-ignition engine is an Otto cycle engine.