US for 2007 (Vlasic , 2008 ) The Prius is a vehicle run by a battery but has an electric motor and a petrol-powered engine . This means that during stop lights and downhill stretches , the car is simply run by the battery and will only use gas upon the need for higher speed . Ergo , approximately 3 .5 million fewer tons of carbon dioxide had been saved by these cars in the short span of time (Mendoza ) This not only means less pollution...
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