Used that fuel saver on my devil tractor it was about 5mm over half now its on half after spraying the farm with fert usely it would have used 30 l of gas so should be under quarter a tank left so must be Saveing 80% on desire and Saveing 50% on petrol but dont know if it works on things over the year 2001 anything newer it will work on as car compeneys done a deal Le with gas compeneys to use mor gas in 2001