Others will chime in no doubt, but..

Mine is not EXACTLY on the "1," but it's not one tick away, either.

Most cars I've owned - this is my first BMW - had the opposite effect, though, that is to say they went down from "F" slowly and then much faster as it approached "E."

At least for this one, it seems to be steady and consistent (given driving habits, of course). But it's always just a hair under the "1" when full.