Elon said:"It will be possible to have a 500-mile range car. In fact we could do it quite soon, but it would increase the price. Over time you could expect to have that kind of range." Elon Musk: Tesla boss on EVs with 500-mile range and colonies on Mars | Auto Express We know that BMW and Nissan are busy cooking their e-cars. The 500-mile range will give TM another decisive advantage over its rivals in the next few years. I'd like to discuss the following: 1. what technology does TM use? Bigger battery package,metal-air battery? 2. The impact on performance and price? 3. Will it be available in the next few years? 4. How many people really need it, say if it adds $20K to the original price? I know many TM buyers in China really want 500-mile ones, even if it's $50k more expensive than p85 since it's still pretty inconvenient to access charging facilities in China。Also, Model S is really inexpensive when comparing with Mercedes S550, Bimmer 750, Lexus 460, Audi A8 etc.