I was looking at Mike Acres site and the Super XP 1020 is shown as being able to use up to a 60" guide bar, and the regular old XP 1020 only rated up to a 30" guide bar. Why the vast difference in bar sizes? Not sure why that would be. Both saws are 100cc. All I can figure is the Super possibly has an automatic oiler with manual override. And the Super seems to come standard with a full wrap handle. Anybody have any input? Its got me stumped! (no pun intended) Den. .