I bought a car through Autotrader, which told me my address was 270 miles from the garage. It was in fact about 350 miles. This morning I noted mileages from six adverts and each mileage was underestimated by about 25 per cent. The only explanation I can come up with is that Autotrader is making the journey look less onerous. They are deceiving their readers, John. You must act swiftly to save car buyers from this extra travelling, and therefore cost and time and aggravation.