I fill mine to the brim and the gauge does not move for ages on mine either. Obviously the sensor/float only goes so high and when you over fill it, it takes ages to drop. I do notice with mine that it's great on fuel according to the gauge until it gets to half a tank, then it seems to drop faster, but after working in a Nissan dealership, they all seem to do this, so I wouldn't worry. Just keep an eye on your mpg. Oh, and if you have the 1.2 3cylinder engine, clean your spark plugs every 3000miles, and replace them when they look worn. Don't leave them in for 40-60 thousand miles like it says, replace them every 20-30,000. It will run better.
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