I just recently changed my oil and switched over to Mobil 1 5w-40 TDT oil and I put 6.4 (slightly off...I put in 6qts plus 12oz) quarts in. I let it set over night to observe the fill level on the dipstick. This is where it was at:

The level was high enough to just cover the "M" on "Min". That was on Wednesday. I re-checked the level this past Saturday and this was where it was at:

The level had come down a tad so the the "M" in "Min" was visible. This was once, once again, after sitting over night in the same spot. I know the dipsticks are incorrect but I would have thought the first reading would have been correct after putting in a meaured 6.4 qts. Which level looks more accurate? I am trying to get the correct fill level down so if I have to add any oil between changes I get it to the optimum fill level without over filling.
Also.....how much, if any, should I expect to have to add between changes on a 6,000 miles change interval?
Thanks, Jim