I thought that free supercharger miles earned by using a referral link when purchasing your Tesla expired after 12 months? However, I bought my car early September 2020 and noticed today that the "Loot" box in the Android app no longer shows any mention of miles (or kWh) remaining. I can see from my usage history on Tesla's website that I should have 280kWh remaining. This makes me wonder if they have in fact expired after six months? Annoying if so as I could have used 'em if I'd realised!