Autobiographical novels and memoirs - Fiction or Non-Fiction?

Would autobiographical novels and memoirs fall into the category of fiction or that of non-fiction? Or even a mix of both? What's the new trend?
A panel discussion on "Writing the Self: On memoir and the autobiographical novel" at the ongoing Jaipur Literature festival raised these questions.
British novelist, William Sutcliffe pointed out that authors of fiction often asked such questions like 'How much of the book is true?, "How much of the book derives inspiration from real life incidents", "How much of it is filtered", "What, when, where?"
William was in conversation with Ved Mehta, Ru Freeman, Joseph O' Neil and Philip Hensher while they tried to decode the line between fiction and non-fiction.

The distinction between fiction and non-fiction for autobiographical novels and memoirs is getting blurred with time. With different portrayal of truths in non-fiction as factual truths and journalistic truths, the distinction is becoming complicated, said Irish novelist and non fiction writer, Joseph O' Neil.
According to Ved Mehta, the distinction might be blurred but is not worth ignoring at all.

"Truth is elusive and it can be made beautiful with the way you write it. Some of the fiction works are so wonderfully done that the readers are compelled to think of the text having some real life inspiration. But writing skillfully and writing fact fully and truthfully are two different things," he said.

Neil said he believed the need of adding some fictitious elements is sometimes justified too.
"Sometimes a few autobiographical texts give impression to the readers that some shortcuts have been taken in biography and some facts have been suppressed to make it palatable. So, it becomes necessary to add some links or some connecting dots to make the text complete, but they might be fiction pieces but can't be untrue," he said.