Assertion: gas's ethanol | /r/AtLocation | gasohol
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text: High energy density Low risk of catching fire, as they do not form a flammable vapour Biodiesel is an easily synthesised, non-petroleum-based fuel (through transesterification) which can run directly in many diesel engines, while gasoline engines either need adaptation to run synthetic fuels or else use them as an additive to gasoline (e.g., ethanol added to gasohol).