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A new Mazda model debuting in Japan gets its high fuel economy from an improved gas engine and a lightweight design.
A technology coming to Chrysler vehicles can improve the fuel economy of standard gasoline engines by 25 percent.
Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
The Scuderi engine could substantially improve fuel consumption by storing compressed air.
Precise combustion control cuts fuel consumption by more than 30 percent.
The device uses thermoacoustics for greater efficiency.