I currently own a P60 (P4001) and have had the car for about 1 1/2 years. It was last year where I found that I missed an important part regarding options when ordering my P60. I was on I95 in Connecticut and pulled into Milford to a fairly new Tesla supercharger platform. Upon plugging my P60 in, a display on my dashboard popped up indicating that the car was not configured for use with a supercharger. I called Tesla and via the airwaves the car was configured to accept the supercharger and instead of just a one time courtesy charge, I paid $2500 to have the option to accept a supercharger installed permanently. This brings up a couple of points to consider. First, the cost difference from a P60 to a P85 was not really $10,000, but $7,500 (the supercharger option is standard on a P85). Second, if I do wish to use my MS for long trips, even with the supercharger option, it is a bit difficult with a P60. I have really enjoyed my P60 and for the most part it is fine for the distances I travel. However, I am not considering using it many times because of the limitation it has. So, the question that keeps coming up in my mind is, is it worth considering a trade in to move up to the P85?. And is so, is there a trade in program from Tesla? My MS , as noted has the supercharger option installed and has recently had all of the updates performed / installed by Tesla in Syosset NY. Any ideas?