i had the same issue with the gas gauge on my 2011 x5. When i filled up the car the gauge did not go all the way to full using 93 octane BP gasoline. any updates from the dealer? was it a mechanical/sensor issue? Also this is a newbie question but i was just interested: i do not have factory navigation on my car, but what would happen if i put a bmw navigation disc in my cd drive? would it read it at all? Just curious and probably a stupid question lol