Peter, how do you calibrate your tyre pressure gauge to measure 0.5psi and what were the tyre temperatures when you measure it and was the temperature sensor calibrated? Get my point? Fascinating stuff and great research but I doubt most of us have the equipment to measure our tyre pressures accurately, it's good to be aware though. I remember years ago talking to a race mechanic in the pits who was throwing talcum powder on a sheet of smooth side up hardboard on the pit garage floor. I was intrigued and he said he was checking the tyre pressures, he rolled the car backwards and the rear slicks (from a Formula 5000) went over the talc and looked to see how much and where the tyre had picked up. I was open jawed and he said its a very old trick and shows how much of the tyre is in contact. He was not messing about and as the car was driven by Mike Hailwood (I think it was Matchbox sponsored?) it was a serious team. I like your methodology but know I have 3 gauges and not cheap ones and they are all +/- a couple of PSI and the thought of 0.5 PSI is outside my kits scope.
