I don't think I would read the ending. I might skip ahead a few pages. Maybe read the pages prior to where I was a few times to make sure I got the details right. But the mystery would be missing if you read the entire book. I would also be disappointed if it was a novella instead of a epic.
I definitely wouldn't read the ending! What if it was way shorter than you thought it would be? I'd be afraid that would make me unable to enjoy anything else for the rest of the 'book.' Plus, I enjoy living in the moment. If I read the end, I'd always be waiting for that next thing to happen and possibly miss out on what's going on now.
If you were given a book with a story of your life, will you read the ending? why?or why not?