Creating a new thread because I just got the excise tax bill from Cambridge for my fully loaded except for Ludicrous P90D Model X, and have had no responses to my posts on the Model S excise tax discussion thread. Tax date: 3/30/16 (delivery date) Taxable value: $129,800 Tax: $2704.17 Wow - I paid $1146 on my 2013 S85 in summer of 2013. This seems high - could be MSRP of the P90D Model X. It would be nice to know if others are getting billed similar amounts, or if there is a way to challenge this to get the Model X base price or 90D base price as the tax base. Thanks in advance.