A and C
Get 100 PA28 archer owners in a group. Ask them the average fuel burn of their aircraft. I bet at least 80 of them say 40ltr and hour.
Which incidentaly 2 of us which again incidentaly specificaly talk about archers said 40ltr an hour. All the other posts are tangents including mine.
Now had the original question been "What is the fuel burn of an archer at 62.3% power setting at 5324ft" then your opinion would actualy be about right.
But I do agree the POH is the oracle as far as figures ar concerned, due to the fact that as demonstrated us pilots all have different opinions/views/ideas/answers.