I know what all the markings mean. I also do my pressures by what I feel through the wheel (I want to feel every imperfection in the road when I test drive!). Recently I have been using a formula I read about: take the vehicle weight (pounds), divide by 100, add 2 all around, and add 2 for the engine end of the car (front or rear). That's where I have been setting my tire pressures for reference points. That's what I did for my 240SX when I brought it home (it still does not run so I don't know how the pressures are working yet), but that formual has been a great starting point.
I never knew about all that other stuff though. I find that weird that the OEMs would do that, but it makes sense I guess. And no, my tires do wear evenly.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield

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