3.7 / 4 it really doesn't matter. I just changed mine too and left it just shy of full. Have no idea how much oil is left over. Any over fill will be wasted. I usually get a free quart every 4 or 5 changes, if you know what I mean. I use the sight glass.
Anywhere between low and full is good
I agree that sounds like a good plan.
However in my case using 4 quarts never puts the level over the full mark.
Maybe because these motors are almost bulletproof the low indication is good enough?
Also using all 4 quarts I don't have to keep partial bottles of oil around - I have enough stuff to keep track of.....