Thanks to all for taking the time to reply to my post its much appreciated. I do not know how accurate this snippet of information an Audi technican told me but here goes The electric fuel pump is designed to be submerged in fuel to help cooling issues so even when 0 miles is showing there can still be as much as 7 litres still in the tank. Also apparently in Germany running out of fuel on the Autobahn is an offence so this also allows the driver some 60 miles to refill should the car say 0 miles. Either way thanks all at least I know Ive not been short changed with a smaller fuel tank!!