So, the Mrs.' car has one of those "tire pressure indicator" lights on the dashboard. You know what I'm talking about: a warning light goes on when one of the tires is a certain percentage below the recommended air pressure. Her car even has a helpful schematic that shows which tire is responsible.
Sounds great, doesn't it? I know one of my biggest worries with the truck stems from tire pressure. Now, granted, that comes from having run over a large spike, blowing one of the rear tires, and having to deal with a 3-ton pickup truck with only three points of contact with the ground instead of four (yes, I know the blown tire was still contacting the ground, but you know what I mean).
Except that the sensor has been right twice, and wrong about 180 other times.
It kicks on when the temperature changes. It kicks on when it rains. It kicks on when a butterfly flaps its wings too fast in the Andes. It's on a lot. When we first got the car, the light coming on was cause for much consternation. "Check the tire pressure, quick!" we'd yell, as these are moderately pricey tires (and there may have been an incident involving a car that needed an alignment and four new Pirelli tires, two of which were ruined inside of a month that I may or may not have reminded the Mrs. of once or a dozen times...)
So, now, we ignore the light. Sure, I'll glance at the alleged offender when I get out of the car, see that it doesn't look low. I might even hook it up to the (free) air station at the local gas station to find out that the tire is perfectly fine. More or less, though, we don't pay the light any attention whatsoever.
Basically, that warning light is useless. It has been used so many times, and been wrong so many times, that the one or two times that a tire has actually been low (and not dangerously low either time, once it was 10 PSI low, the other in the single digits) it's been right only through attrition. Imagine that: cry wolf enough times, and the warning starts going unheeded.
It's almost like something else I keep hearing, but just can't put my finger on...
That is all.
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