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Computer controlled direct injection and turbos are where it's at.
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Do modern direct injectors do much the same thing with their extreme atomization and instantaneous multi injection control where we will soon have turbo engines running 30:1 total compression ratio with a stratified charge on pump gas without the need for spark ignition while cruising. If we would relax the NOX emissions standards we could do this now and would be well on our way to 50% efficiency with still acceptable HC output. Computer control of the throttle plate and turbo boost allows a major reduction in pumping losses at lower loads.
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The only drawback is the incredible increase in price and complexity for all of this which makes it impossible to market in a 200 mpgUS streamlined two seater.
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