There is always the manual old school method of confirmation. Calculate manually once or twice and that will also let you know once and for all how accurate this information display is.
Fill your tank to the top and trip the meter, at next fill up again fill to the top and simply divide the kilometres driven by litres refilled. Or do the same method with autostop fill. If its autostop then next tank should also be autostop. Don't do top fill once and then next time autostop of the pump. That won't be accurate.
