And now it has taken me only reading your post to finally work out what the hell has been going on ! although i had always assumed that if your line was above 90 that was good !
The assumption is that 90 points will win the title. To get there, you win all your home games (19 x par 3 = 57 points), win your 7 easiest away games against the 3 promoted teams and the teams that finished 14th-17th (7 x par 3 = 21 points) and draw the other 12 aways (12 x par 1 = 12 points), totalling (57 + 21 + 12 = 90 points).
Currently, we've dropped 2 points from a par 3 against Man City at home, but we've been par or above on the others. Against the top 6, draws against Chelsea and Arsenal away were par, while the win against Tottenham was 2 above par.
I still don't quite get the tables posted by RooiBefok though.