Ockie
Resident Lead Bender
Do the milk test.
Keep in on 3. Buy a 1l milk sachet, and use it till empty (or milk turns sour). Make a note of how long it lasted.
Turn it down to 2. Buy a 1l milk sachet, and repeat the above experiment. If the milk turns sour too quick, then 2 won't work.
Also look at your veggies. If they stay fresher longer on 3 than on 2, keep it on 3.
Who the hell has time for that!
Besides ... I dont have milk. Can I test it with wine?