Your experiences seem to be different from others. I do not believe Scanguage actually takes input from actual fuel level (from the tank sender) like the car system does but takes a known volume of fuel and calculates theoretical fuel remaining based on fuel burn.
Hence the requirement to do the fillup procedure on each fill - the tank must go to fill for it to work. If the tank needs 60l to fill and you only put in 30litres Scangauge thinks you only needed 30l to fill and therefore you have been getting far better fuel fuel consumption than you are getting.
When programming the Scangauge it would not have been hard to program in a partial fill system when it was first being designed.
Thanks to everyone for your comments. I haven't really looked at the X guage side of things yet but I want to in the future so I can have a mix of gauge functions and trip functions displayed in the window at the same time.
Cheers
Garry

