For example: A 61" mower is run so many hours a year should make this amount etc... A 48" mower is run so many hours a year should make this amount etc... I know it depends on the transmission speed. Say average 6-8 mph. I am trying to figure out what i should be making on each mower. So i can say well, either I have some bad apples in my client list or I need to rethink about the kind of properties i am managing. For example if i have a business that has 30 mins of grass but it takes 15 mins of running around the parking lot to get it all done ( concerned about tire wear). I am trying to get down to the brass tacks in my bookkeeping I am currently trying to figure out what I am asking here. I was just wondering if there a standard deviant out there. Ok this mower should be producing 50,000 worth of revenue with a .15 cent repair and upkeep expense per hour.. I have 2: 61" scags and 2: 48 in ( one gravely and one exmark ) ztr's. Just bought the 2 48" ztrs this year.