Toyota has Atkinson cycle engines that get 78 mpg that will be in 14 car models in 2015

Toyota has launched two new small-displacement, Atkinson cycle engines that get 78 mpg.

Built to power the Japanese-automaker’s Aygo commuter and the 2015 Lexus RC F, respectively, the new Atkinson-cycle engines will come in 1.0 and 1.3L versions. While neither engine will generate frame-crunching torque, their higher compression ratios, improved combustion chamber design, weight reduction and reduced frictional energy loses will mean major gas savings for drivers.

Toyota plans to use the engine in at least 14 car models in 2015 and this is the first time the Atkinson design will be a stand-alone power plant. The Atkinson engine is used in the Toyota Prius.

The Atkinson engine will have 30% better fuel efficiency than the Toyota engine it replaces.

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