I got 5,000 free miles that was supposed to be used up within 6 months (unless I got someone to use my referral code, then it resets that 6 months and adds another 1,000 miles). But on a road trip to Charlotte for a Knights playoff game (until they lost 6 of their last 7 games in an epic collapse) there was some sort of glitch and it stopped subtracting my free miles. So it's been hung at 1672 miles remaining since September. It also didn't go away after 6 months. As of now, the current message says my Supercharging miles will expire on June 30th, 2020, so I guess I'll find out in about 10 days whether or not I have to start paying to charge my car or not.