This is for you engineering/math/Tesla nerds in this group. (I just called Tesla and asked them this question and they are stumped. They even "asked the factory".) Let's see who can answer this one. In the USA, the range Tesla advertises across all vehicles is based on the EPA rating of 300Wh/mi. Here's the question: what is it in China? Here is what I pulled from the design studio from tesla.com and tesla.cn. It seems that Tesla advertises very different numbers for the same cars. For example, a Model S P100D in America, rated at our standard 300Wh/mi, is advertised with a range of 315mi. That SAME car, as advertised by Tesla in China, has a range of 345mi. That's 39mi (112%) more range in China than in the US. Moreover, the range difference is different for every model! So a Model X 100D in America has a range of 295mi, but in China has 343mi, for a difference of 48mi (116%). First person to figure this out wins.