[cplease]

Except I never made the claim that nominal mileage objectively indicates vehicle wear. All I'm claiming, is that mileage is the largest factor. It doesn't matter if your driving wears out a car in 300,000 miles and my driving burns out a car at 80,000 miles. Your miles are your miles and my miles are my miles.

If we somehow manage to magically share a car, it's not going to last a lot longer than if we're wearing out our own cars at our respective rates (mine faster than yours).

But you reinforce the point that the car sitting in the parking lot or garage is not simply an over-provisioned resource by reason of being idle. If your usage patterns are so different than mine it's unrealistic to expect a configuration where we would be able to share a car.

Car-sharing has many benefits, but a car is still worth more than two half-cars.