Maybe, but my guess is that buying them new and then maintaining and driving them for 250k miles or more would calculate out the best.

(Buying used with around 25k miles would be even better, but hard to scale up.)

But you don't see that, I think because the main factor in their calculation is the customer experience of driving a fresh, new car that rarely has any mechanical trouble and that keeps customers coming back which outweighs all the other savings.