andom tests by AA/RAC etc usually find many cars with tyres seriously underinflated, drivers mustn't notice and never check.

Daughter was stopped by plod and asked "do you know you've got a flat tyre?" She honestly replied "no".

I pointed out one tyre on her car was borderline legal. She admitted that was the first time in twelve years she'd had to replace a worn out tyre. All the others were because of damge.

I run way over the recommended tyre pressures, which I understand are optimised for comfort rather than handling or fuel economy.

If I had a new car with TPMS I suppose I'd have to do as I'm told.

If I had a Ford with TPMS I'd have to do as I'm told by the people who recommended the low tyre pressures at least partly responsible for the Bridgestone/Explorer rollover debacle.

Actual tyre pressures vary due to "factors"

1. ambient air temperature causes tyre pressures to increase (when warmer) and decrease (when cooler).

2. rubber tyres VERY slowly leak air at a microscopic level

I advise you check your tyres at least once a month along with your oil/coolant & lights.

This is especially important prior to commencing a long journey when the tyres are subjected to prolonged friction/heat or heavier loads.

Tyres should always be checked (when cool) late evening or early morning when the ambient air temperature is cool and no direct sunlight

If everyone did this the EU would not have had to impose TPMS systems