I was a teen with a driver’s license in hand. I asked my dad what a reasonable mileage for a car was and he said - I wouldn’t get anything over 100k miles.

It may or may not still be a case for dinosaur tears fueled cars.

But...

What’s a reasonable mileage for a hybrid car now? (Prius)

What’s a reasonable mileage for a fully electric car now? (Tesla)

What’s a reasonable mileage for a hydrogen car? (Toyota Mirai)

and more importantly - WHY