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The device uses thermoacoustics for greater efficiency.
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.
Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
A technology coming to Chrysler vehicles can improve the fuel economy of standard gasoline engines by 25 percent.
Precise combustion control cuts fuel consumption by more than 30 percent.