Hearthly wrote:
It's a bit more low tech than that, one simply looks at the tyres and decides if they appear to be inflated enough or not.
Turns out I really wasn't lying about this.
Now, in fairness to myself, I have thought that the rear passenger side tyre has been looking a little on the spongy side for a while, but since, y'know, 20 year old Toyota Camry that I just waft around in, when I use it at all (it generally moves about once per week), I didn't go to the next stage in the process and actually check the pressure.
However, today I had to fill it up with petrol (fuck me a tank of petrol lasts a long time now), and as I was brimming the tank (which adds a bit of weight over that tyre I suppose), I thought, 'Hmmm, that tyre does look rather spongy, I shall check the pressure'.
So after paying for the petrol I drove off the forecourt and parked up, got my tyre pressure gauge out.
Erm, yeah, 10.5 psi, and this was after a drive - oops. It's supposed to be 38psi when cold. (Well, 33 or 38 according to the little sticker thing inside the door, depending on load and speed.)
Anyway, all sorted now, clearly it's losing pressure (very slowly), I'll check it more often in future.