The most I've ever got into my tank on filling up is about 35 litres from apparently showing it's on vapours,according to the gauge, and the first click off at full fill. Since the tank is supposed to be 55litres that is 20 litres adrift! Haven't had the bottle yet to test out where the other 20 litres are and also work on the trip meter for piece of mind! It's a MorganSir....they all do that!