At first I thought why Motor Trend is comparing the king of luxury class Mercedes S with Tesla. What for? Is Tesla such a great and luxury car?
The answer is that the world is changing and progress in automotive market goes into looking for alternative fuel sources. That is why Tesla can be compared with any of famous brands which change their models by design, equipment and minor engine modifications.
Tesla is going one step further giving us an answer how to take care about enviroment. However is it enough to beat best in class Mercedes S550?