Okay may be a foolish question but here goes: I got into an arguement today with a buddy trying to convince him that equipment running hours are different than just an hour on a clock of run time. I think I'm right, pretty damn sure at least, but why, and how?? He'll believe me once I can back it up with some real explanation. I figure it has something to do with what RPM's your running at, and maybe counts hours my the firing pattern?? Thanks in Advance guys!!