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Mileage per year has been covered. That is useful only when assessing new cars as they age, comparatively to other same-age cars.

However, regardless of year, once a car hits 100k miles it starts to become way less valuable in the used/auction market, regardless of age.

That's how I see it though. A 200k mile car will almost always be worthless in the auction world, and only valuable to enthusiasts.