your post basically makes no sense.The cost difference in terms of ownership is going to be a lot lower for a Model Y. You can expect a Y to hold its value for longer (new in demand model that's probably production limited). The energy efficiency is much better, the battery tech is likely better (less chance of supercharging getting throttled), and the supercharging is likely faster--at least until Plaid Model X comes out. Higher efficiency also means faster AC charging as 30 or 48 amp level 2 charging gets you a lot more miles per hour charged.
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how do you know the cost of ownership for a car that hasn't come out yet ? First model year has more problems than later years....bugs arn't worked out yet, so i would argue the opposite for the first few years... How do you know the battery tech is "much better" ... its a 10mile difference between the MXP and MYP ... and the X weighs more... so which is more efficient... and faster... 3.5s Y vs 2.7s X
supercharging is "likely faster" again you have no idea. Basically you have no idea on any of the "facts" but could be !!!