I remember my training days when there were club approach speeds. Upon reading the actual POH I realised that I could chop about 300 metres off my landings by using the speeds that the manufacturer recommended. Funny thing that...
The only aircraft I've flown with any regularity that I'm unable to grease on is an Arrow. I know that greasing it on is not neccessary but it just gives me a little smile of satisfaction when I do. It always seems to come down with a bit of a clunk.