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Novel engine designs could help meet our growing demand for energy.
Design cuts pollution–but is it practical?
A supercritical diesel engine could increase efficiency and cut emissions.
An “adaptive” engine promises to make ethanol more competitive.
Storing energy with compressed air, rather than batteries, could cut the cost of hybrid vehicles.
An engine from Lotus and Continental Powertrain consumes 15 percent less fuel.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.