I keep mine topped up to just under Max and check one per month. The in car gauge is very good but I like to check it manually just to be extra sure. Nine times out of ten she needs a little bit of a top up...
didn't want to comment on my oil useage when this thread started as i've never kept a serious eye on it but since its been mentioned i've checked it regular for roughly 3 weeks and it doesn't seem to use any oil at all