Toyota Develops The Most Thermally Efficient Petrol Engine

Toyota has developed a 2.0-litre, four-cylinder petrol engine that is said to have a thermal efficiency of 40 percent – just 1 percent short of what the Prius offers with its 1.8-litre hybrid powertrain.

Toyota states that the engine can achieve unparalleled levels of fuel economy as a result of new friction-reducing technology and more efficient exhaust and cooling systems. In general, petrol engines have a thermal efficiency of about 20-25 percent.

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