Toyota: A Guide to Hybrid Synergy Drive

Is it really feasible to produce a car that offers advanced performance features while also pre-serving the environment? YES! Ordinary powertrains waste energy at stoplights, during braking, and all other times the engine is not running at optimum speed under ideal load conditions. By reducing energy wastage and applying energy more efficiently, a hybrid system can simultaneously double fuel economy, slash emissions, provide quiet operation and deliver "fun to drive" performance. [via]

http://www.toyota.co.jp/en/tech/environment/h...