The technology for electric cars is getting better and better.. A high end model is the Tesla Roadster, and it does 0-60 in 3.7 seconds with a 288 hp engine.. A Viper does 0-60 in 4.0 seconds.. What's amazing about these electric cars is the efficiency of the engines, which is over 90%.. A typical gasoline-powered piston engine only runs at around 20% efficiency, with the vast amount of energy wasted as heat..