Long time lurker, first time poster. Even though I have never considered purchasing a car anywhere near this price point, I am becoming obsessed with a Model X. I have a couple of battery questions- I have done a fair bit of searching but have not been able to come up with a satisfactory answer. At least here in Canada, the Tesla web site shows the 75D with a 381 KM range, and the 100D with a 475 KM range. The previous iterations, at least in the X, seems to have been primarily the 90 with about a 402 km range (and most of the MS in the CPO are 85) - is this simply a matter of Tesla being able to unlock more efficiency out of the same technology but the current discrepancy between the 2 models (75 to 100) seems more pronounced than in some of the older cars. The price difference (again, here in Canada) between the MX 75D and the 100D is about $25,000. That is a hefty premium and while I have read lots of different "theories" (you only need the longer range if you will do road trips, for city use, save the money etc etc) - is it fair to say that "battery size" is akin to computer hard drive size? You can never have too much space? When you buy a new laptop / phone, sometimes the tendency is to try and save some money and get a smaller hard drive because you can't imagine how you will ever fill up so much space - but over time, somehow that seems to happen. On the same theory, that you can never have too much memory, space, etc, (subject to affordability of coursE) is the "better approach" to take a similar view and if one can afford it, just get the bigger battery? Thanx in advance for helping me on this journey. (Wow, these cars are expensive!) - sorry, couldn't resist.