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