I just saw people asking about it, so I answered the question. When I first got it, I was able to do the math and determine that 60% + was a good percentage. On the LOG setting, I have gotten it as high as 73%. Though I still like to have the actual percentage because it just takes the guessing out of it.
This is CABL.com posting #250997. Tiny Link: cabl.co/mbdsv