I never read autobiographies, because they're a rip-off.
They purport to be an account of a person's life, but it's never the person's WHOLE life, because after they finish writing it, they keep living longer and do more stuff.
And it seems unreasonable for an autobiography to require a sequel.
(Except in situations of someone who remembers past lives.)
So, I would read an autobiography under only two conditions:
1) The author promises never to do anything interesting after the book is finished.
2) The author kills themself right as they finish.
Option two seems the purest, most trustworthy way to guarantee that you're getting the whole story.
(Unless there is an afterlife, in which case I would hope that the author's ghost writer would provide the necessary details after the fact.)