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...maximum MEP produces best MPG at lowest RPM.
...thus, relying solely upon VVT does NOT "extract" the MOST from gasoline having higher octane, it only yields "...slightly more knock resistance than the regular octane."
...actually 'boosting' the effective-CR (via turbocharging), allows ignition to occur at the "optimum" crank-angle that produces maximum MEP, instead of too soon/too late as happens with VVT alone.
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