Heres the problem with those numbers. Most Teslas that are spontaneously combusting are doing so parked without being in operation. Therefore mileage is an irrelevant stastitic. Any Tesla can spontaneously combust during any solar storm that may occur without ever moving. You just never know when it'll happen. Induced heating of 18650 cells can happen in a brand new Tesla, like seen in the recent Tesla Plaid. However as Teslas age they should become more risky for fires as dendrites build up inside due to, in part, surface electromagnetic fields brought on by solar storms. Lithium batteries are ticking time bombs but you never know when they'll blow.