On our 06 Infiniti M45, which loses 1 qt ~2000 miles, I will add 1 qt every 2000 miles. The dipstick on this car is atypical in that there's about 2qts between the full and low marks. So after 2000 miles, the oil level is about at the midpoint on the dipstick and adding 1 qt gets it back to the full mark.
On our 18 CRV, which is a fuel diluter, I underfill the sump at oil change by about 0.3qt. It's a 3.7qt capacity, so that means I put 3.4qt in. This gets the oil level at about the midpoint on the dipstick. This serves two purposes:
1) the orange tip on the dipstick is super hard to read oil levels on and the fuller it is, the harder it is to tell. At the midpoint, it's easier to see the oil level.
2) it makes it easy for me to track fuel dilution and leaves a little clearance to keep the sump from going beyond the full mark. So if/when the oil level reaches the full mark, I can see how many miles it took to "gain" 0.3qt of fuel and have an estimate of fuel dilution %.