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The Tire Pressure monitoring System (TPMS) takes the current pressure at the time it is reset. If you reset it when there was low air, then it wouldn't show as low.
Run flats use a solid side-wall (usually metal) to hold the weight of the car for a short amount of time when the tire goes flat. However, the weight of the car will cause stress fractures and cracks in the metal. This is why they are only rated for about 50 miles and are not supposed to be repaired. If you get a flat from a nail or something, and drive your car with the run-flats, it is recommended that the tire be replaced instead of repaired. While a repair will still fix the tire and you can drive it with normal tire pressure just fine, if the tire goes flat, the additional stress on the reinforced side-walls can cause the tire to fail, although I believe at that point it will just be like a normal flat. Hopefully it doesn't fail at high speeds.
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