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...since engine "efficiency" is a function of CR, increasing CR is going the right way, however, eliminating spark-ignition is / has been very difficult proposition because of the vastly different burning characteristics & rates of gasoline and diesel fuels. That's *why* HCCI engines commonly employ both SI and DI -- SI (spark-ignition) when the engine is under heavy loads and high engine speeds and DI (diesel-ignition) during light loads and moderate engine speeds.
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