The garages stopped doing "free air" when the Weights & Measures folks got involved and the gauges they use MUST (by law) be accurate.
They can now be "done" for an inaccurate gauge, so have to PAY, yes PAY, to have the system calibrated. Add the cost of the equipment, cost of electricity and the replacement costs of all the gauges the inconsiderate idiots break by throwing them on the floor/running over them etc etc .. and I'm not surprised a charge is made.
IAM ....
........ The era of ‘free air’ at garages appears to be ending. However, charging for air does seem to be improving pressure gauge accuracy. The lAM Trust survey shows more than 80 per cent of air lines to be accurate within 5 per cent or 2psi, a significant improvement on the 2005 check, which found 50 per cent of gauges to be inaccurate. The new survey also shows that 71 per cent of drivers would be willing swap pounds sterling for pounds per square inch, to ensure accuracy and well-maintained air lines.
Most motorists feel that 20p or 50p is a reasonable price to pay for reliable, accurate and clean airlines at a garage. However, if the price were to be £1, just one in eight men would be prepared to pay but almost a third of women think it a reasonable charge.....