Last week, Tesla quietly added a new variant – the 100D – in the line-up of the Model S. The Model S 100D is capable of doing an EPA (the United States Environmental Protection Agency) rated figure of 335 miles (nearly 540km), making it the longest-range electric vehicle (EV) on sale. No, don't get confused between the 100D and the P100D. The latter is the performance-oriented version of the Model S, which was introduced in August last year. And it also happens to be the quickest-accelerating electric car in the world – clocking 0-60mph (96kmph) in 2.5 seconds. However, both the versions use a common 100kWh battery pack.