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Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
A novel fuel-injection system achieves 64 miles per gallon.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.
A supercritical diesel engine could increase efficiency and cut emissions.
Achates Power gets $5 million to build a multi-cylinder version of its diesel engine.
The Scuderi engine could substantially improve fuel consumption by storing compressed air.
A new Mazda model debuting in Japan gets its high fuel economy from an improved gas engine and a lightweight design.
Precise combustion control cuts fuel consumption by more than 30 percent.
An engine from Lotus and Continental Powertrain consumes 15 percent less fuel.