Ask him to account for it. If he can't do it, then consider commencing action under your disciplinary procedure and if there is still no satisfactory explanation, issue a verbal or written warning. It is unreasonable to expect your sales people always to travel from one appointment to another by the most direct route, but if there is a variation in the mileage of more than, say, 25 per cent, they should expect to be asked to account for it.
