I have never used auto bracket until this morning. But it is something I want to learn so I started playing around using -.5 ,0 , +.5 to see what I would get. The 0 and +.5 were always acceptable captures. Rather than reinventing the wheel what seems to work best for the various lighting combinations?
Since I almost never cared for the first round of images at -.5, when I play later today I will see if I can set it for 0, +.5, +1.
PS: When you confuse the continuous and auto bracket settings you get the same image a lot.