My next Tesla will be a M3 for sure and I'm wondering if it would be a better value to trade in my 2018 MS P100D now or wait until later. The car runs fine, has 37,000 miles and I love it but will not be able to afford another MS. How are current trade in values for 2018 MS P100Ds? My car also has the free lifetime supercharging, but I rarely use it.