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...Spark-Ignition Direct-Injection (SIDI) for gasoline engines is the "next BIG thing"--Toyota, GM and Ford are using it already with 10-15% increases in both HP and fuel economy and 10-15% decreases in emissions.
...to be followed by Homogenious-Charge Compression-Ignition (HCCI) which is essentially a gasoline-fed diesel engine that reverts to spark-ignition when compression-ignition cannot be reliably maintained.
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