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MetroMPG -- agreed! HCCI is 100%-time lean-burn, but with diesel-like efficiencies due to high CR and high in-cylinder temps (ala' diesel). The problem (so far) has been maintaining drivability across the whole idle-to-high-rpm range, which (so far) has been only partially compensated by reverting to spark-plug ignition at partthrottle speeds where the very-lean AF mixture makes sparkplugs almost useless.
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