Bought myself a scangauge unit the other week, installed easily and simply enough setup as per the instructions - 11 Gallon Tank 1.7 Litre Engine Dieselb (As the test shows that the GPH doesn't move at all when set to a and the revs taken up to 1500) Fillups - 1st as per instructions 2nd - Had to add 90% to correct the under reading of the amount of fuel added 3rd - Had to add 120% to correct the under reading! So I've reset it for the 3rd time and trying again! But I've noticed the following - Random power offs whilst driving, the unit will just power off - not flicker and go to sleep like it does after you switch the engine off, but actually power off! - At this same time it doesn't register the distance I have driven (I reset the car's trip odometer each time I fill up). MPG (Current tank) is off and just seems to be guessing figures (Hence the 3 resets). The MPG (Current trip) can reach 120MPG on steady 20mph driving (eg slow traffic) and sits at a nice 60 - 70mpg at 50-60mph, but jump on the motorway and it'll read around 40-45mpg at 70mph or even less with the cruise control on. Yesterday it read around 20mpg for a nice constant speed of 70mph (So yet again another reset today) over a 30 mile distance, then started to correct itself eventually. Something I am curious about though, how does the unit cope with UK gallons? I can understand the under reading when you add fuel, but the tank size shows 11 Gallons, but correct me if I'm wrong but these will be US gallons which means it's way off for me in the UK. Any help would be appreciated as this unit is annoying the hell out of me!