Don't hum the requiem for the gasoline engine just yet. MIT brainiacs say it's easier than imagined to flip a car between the usual gas-guzzling state to a low-pollution, ultra-efficient mode. The researchers have tested a system that can run on a quarter less than the usual amount of gas without needing any fancy fuel. With the flick of a switch, the setup alternates between regular, spark-triggered combustion and experimental homogeneous charge compression ignition. In the latter system, premixed fuel and air combust when compressed, spewing less soot and NOx from the engine. Volvo has explored the hybrid technology, but …
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