
Green Engine of the Year: Toyota 1.5-litre Hybrid Synergy Drive
Having won the Best Fuel Economy category four years in a row, from 2004 to 2007, the Prius's engine has taken out the replacement category, Green Engine of the Year. The Prius's drivetrain consists of a 57kW 1.5-litre four-cylinder engine and 25kW electric engine, returning a claimed combined consumption rate of 4.4L/100km. Energy which is normally wasted in a motor vehicle — like the heat given off during braking — is recaptured by the Prius to charge its battery pack. Depending on the situation, either one or both of the engines will be driving the car with a seamless transition between driving modes.
Its winning margin was slim this year, just three points over the BMW's 2-litre turbo-diesel which automatically shuts itself down at traffic lights.
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