2011 Nissan LeafThe car he drives now, a Toyota Motor Corp. gas-electric Prius, is the current front-runner in eco-friendly vehicles.On Monday, Nissan Motor Co. will release its all-electric Leaf in Japan.The release of the Leaf, which Nissan calls the world's first mass-produced, regular-sized electric car, is likely to rekindle the market for electric vehicles as other automakers are racing to