Mine did 108 miles on £20, the light had just came on when i put the £20 in 1.30p a litre, and the light had been on for about 5 miles before i re fuelled which works out at around 32mpg? that was some town and some a road and motorway driving, max speed 70 - 80 at 3500 revs, thats a 2 litre ESP tho.. just give it a good service new fuel filter, plugs, disconnect battery for a few hours to reset the ECU check tyre pressures, whats the mileage on it? As they get more miles on they seem to use more fuel my dads 1800 petrol zetec mondeo does 21 mpg max, and it wont do any more than that, its had everything checked and changed but its on 294,000 miles so put it down to worn out..