I am looking to upgrade the battery to 75 on my 60 model. I have the following questions. 1. WOuld there be any tax incentive for this upgrade if i do it next year since i purchased the car this year and claim the electric car incentive next year and claim for battery upgrade 2018 if its available ? 2. Is there any tax Tesla charges for this battery upgrade on $9000. 3. ANyone did this upgrade in recent times and whats their exprience so far with added miles ?