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My first racing school it rained and i was in my DD on my street tires. They were brand new with a mean rain tread and I had excellent grip. I tuned in my tire pressure to the best grip. The next day it was sunny and I was able to bump up about 5psi in each tire before acheiving maximum grip.
Everything in life is an optimazation problem. I don't drive a minivan because I don't need 7 seats. I can't go telling a family of 7 to go buy an econobox. if you air up your tires for psi, you have to drive more carefully, if you do so, you have no loss. You optimize your mileage and lose out on some other aspects. no biggie as long as you know your car's limits.
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