If you put 170k miles on a gas car, wouldn't you have paid for $10-12k in maintenance over that time? At that point you've done 20 oil changes, replaced the spark plugs & air filter 5 times, replaced the timing belt and transmission fluid twice, replaced the brake pads 3-4 times, replaced the brake rotors, water pump, alternator, and maybe even a head gasket, starter motor, and fuel pump.

Assuming you averaged 30mpg, you also put $20k in gas through it. At the current US average retail electricity price of 17 cents per kWh and EV efficiency of 250Wh/mile, recharging would be $7,200 for that same distance. The fuel savings alone are more than the cost of replacing the battery.

For sure. That's why I'm thinking of a battery swap. It'll buy a decade more with the car and is cheaper than any used cars I can find.

I’d say 170k / 5 = 34 * 25 = $850. Throw in air filters, and a couple transmission fluid changes, and it would certainly be under $2k.

That’s assuming DIY, but even if you’re paying $80 per change. If you do them every 7,500… you’re still $1,800 total.

$12k is plenty for a whole new engine, possibly a new engine and transmission on an economy car. For example, Ford will happily sell you a brand new 2.3 Ecoboost for a Mustang or Ranger or Explorer for $6k: https://www.trackey.ford.com/part/M-6007-23TA