This is what I figure my 975 Bob Cat cost per hour. I have had 3 of them over the last 25 years and 2 of them are still running.
Fuel 2 gal/hour @ $5.00/gal $10.00/hr.
tires 1000/hr per set set cost $2000 $2.00/hr.
oil 12 qt per change .25/hr.
Grease 1 tube/10 hr .25/hr
I have replaced 1 seat, a few alternators, and a few batteries in the 7000 hours use of 1 of the machines
Replaced the motor on one that was rolled over and ran upside down for 3 or 4 minutes with out oil. a few windows, Painted each machine at least once,
Basicly they have been maintenance free for the hour they have on them. other then oil and lube.
Hope this helps some.
I charge between $125 and $150 per hour including operator.