At the tire place today, the tire sign said if one tire is bad to replace all four tires at once, because one uneven tire can throw off the computers. That really sounds like a racket, since there is no road on the planet that is absolutely even and flat. Even a pebble on the road would throw off the equal-ness of the tires, so the computers are always calculating for uneven-ness... So one grain of sand of tread difference from one tire to the other sounds like a scam to sell tires...
My not the smartest sister got a flat on her new Audi. So a few days later a 48' air conditioned enclosed trailer showed up from Audi and transported her car three hours away to the dealership to replace all four tires, and then three hours back to her house a few days later for $2000. It just doesn't makes sense..
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