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1.) Hydroplaning: In some aircraft (cars probably the same for the same reasons), hydroplaning speed (expressed in pounds pressure and miles per hour) is 9 X the square root of the tire pressure. So, with 36 lbs. pressure, square root is 6, so 9 X 6 = 54 mph. If you increase tire pressure to 49 lbs., then 9 X 7 = 63 mph, etc.. Increase tire pressure and you increase hydroplaning speed.
2.) Your tires get pressure increases that spike every time you hit a bump or pothole, so they can take a lot of pressure. OTOH, increased baseline pressure puts them closer to ultimate failure pressure upon meeting that fatal pothole. So, if you increase the pressure, be more careful about avoiding potholes, etc..
3.) Per years of empirical evidence from posters here, higher pressure seems not to be a problem with tread wear or tire life, assuming the tires were of good quality, with proper alignment, etc..
4.) Alignment is a big deal for tire wear, mileage, and handling. Use the thread trick to check and align your wheels. Vastly cheaper than commercial methods, and car tracks straight ahead, hands off, at 110 mph.
5.) Noisy tires are probably fuel-inefficient tires, as the noise is probably a product of (inter alia) tire squirm against the pavement, which is surely generating heat as well as noise. (Higher temps also wear out tires quicker, so you're paying for that, too.) I'd hazard a guess that for a given tire, the quietest performance is also the most efficient, and varies with pressure. This would be an interesting experiment.
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