i got the same problem.
Its definitely not fuel problem.. I've been using 98RON Shell, Mobile and BP for the matter and still have the rattling problem.

A/C on or off doesnt matter. Rattling still there.

Only happens with low speed take up. (sounds exactly like when you're in the wrong gear) Noise is coming from the driving side. Clock is sittting on 4000km now. Didn't notice until releasing cos too focus on my steering problem I had (lumpy steering) and also perhaps I have the music pumping before i drive so didnt hear anything.

I will contact Honda service this week. I'll keep everyone posted.