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Spark ignition engines --- Fuel switching --- Alcohol as fuel --- Biodiesel fuels --- Alternative fuels --- Prices --- Clean Cities (Program : U.S.)

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Spark ignition engines --- Fuel switching --- Alcohol as fuel --- Biodiesel fuels --- Alternative fuels --- Prices --- Prices --- Prices --- Prices --- Clean Cities (Program : U.S.)

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Greenhouse gas mitigation --- Clean energy --- Transportation --- Alternative fuel vehicles --- Energy consumption --- Energy conservation --- Clean Cities (Program : U.S.)

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Propane as fuel --- Motor vehicles --- Alternative fuel vehicle industry. --- Costs. --- Fuel systems

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Fuel switching --- Spark ignition engines --- Air --- Transportation --- Alternative fuels --- Pollution --- Prevention --- Energy conservation --- Environmental aspects --- United States.