Then there is the matter of the margin of victory. The record stands
at 18, when Manchester United won the league with 91 points in
1999-2000 and Arsenal came second with 73. The extraordinary thing
about that season is that after 12 games United were only fourth in
the table, with 24 points – that is, eight fewer than Chelsea have
now. Leeds, who finished 22 points adrift, were top with 26, Arsenal a
point behind and Sunderland, playing the Southampton role, ahead of
United on goal difference. United went on to win 21 of their final 26
games of the season.
http://www.theguardian.com/football/blog/2014/nov/27/chelsea-premier-league-records-jose-mourinho?