Greetings from Finland! (my first post here)

I have driven 23 000 km now with my XC without any problems, but one detail kinda annoys me;

If I choose to follow the current consumption on the on-board-computer, it'll be wiped out when I turn the engine off, and has to be recalled every time.

The reason why I became interested in this is, that I somehow managed to keep the readings even when turning the engine off, but haven't been able to replicate that

Any ideas?