If you drive 180,000 miles in 12 years then a gas car costs about US$32,000 for fuel and maintenance. The new Tesla with a million mile battery and cheaper batteries would cost about $6000 for 12 years of operation for electricity and maintenance. A Tesla $25,000 Model 3 would be cheaper to own and operate than free gas car. You would still required to pay gas and maintenance. The Million mile Model 3 would still have 85% of driving range left. You could resell it for $16,000-20,000, which will be higher than the resale value of the gas car.

$25,000 Tesla + $5,000 of ten year operation is $30,000
Free gas car + $32,000 of fuel and maintenance is $32,000

Tesla will use CATL's lithium iron phosphate batteries, which use no cobalt, the most expensive metal in EV batteries.

The cost of CATL's cobalt-free lithium iron phosphate battery packs has fallen below $80 per kilowatt-hour, with the cost of the battery cells dropping below $60/kWh. CATL's low-cobalt NMC battery packs are close to $100/kWh.

This would enable a 50 kwh hour pack to cost $4000 for the battery. This would enable a new Tesla Model 3 with over 300 mile range and have a total car cost of $25,000.