how is what comes out less than what goes in? by how much less wld you say, like to 20 to 30% less?IIRC, the gauge is not absolute. It requires a calibration when the oil is changed, so it "knows" what "full" is, then bases readings off that. So, unless you've followed the procedure in the factory manual, there's no guarantee the reading displayed is accurate. Also, I've found what I drain out at oil change time is measurably different than what I pour in, yet the gauge shows NO difference in level - which makes me not trust the stupid thing in the first place.
As cperez said, I never have to add oil between changes, so I don't worry about it.
On a side note, I don't think it's necessary nor desirable to always have the level at MAX. In the middle is fine. I wouldn't add anything unless it asks for it. The only time you'd be concerned is if using the 15kmi factory change interval, which is a Very Bad Idea, as discussed many times in the past.