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Interestingly, I still had my miles available this morning (7/2) for my first stop, free at 9am. Then they were gone for my second stop, paid at 11:15 and after. They were supposed to expire today(7/2), and they certainly did.
When I bought another Tesla, the previous free miles got extension to 12/31/20 with the additional free miles.
I thought the new miles would be good for a year? But those got only 6 months...