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Set Tire Pressure Gauge

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An expensive digital gauge was used to set the pressure at exactly 12.5 psi on each tire. In reality, the pressure ended up being slightly lower (for all tires) as the drop was done after some pavement driving, which had warmed the tires up. On the other hand, there were times when we drove on pavement for a few miles at "12.5," and consequently increased the pressure by building heat. Still, all tires were subjected to this equally, so there should've been no difference between them.