well fuel is not much of a conceren it is in the 15-25 a day if you run it hard. tires will last 300-500 hours depends on what you run on and how hard you are on them, they are 600-800 a set. a full oil change is around a 100 for all the filters and oil. greese is 30 bucks a case i think i used a case or two last year. it is more of an hourly figure you need to come up with. teeth for the bucket are around 60-80 and last 250 hours? i would say that my cat is around 6-9 dollars an hour to operate. depreastion is another concern, my skid is around 25k new. it has 1300 hours on it and i would say that it is worth around 15k now. so that is 10 an hour which is alot but if i run the machine to around 3000 hours it should be worth 10k. so that is alot better around 5 bucks an hour vs 10 bucks. and you will have a 1000-3000 bill a time or two for machine falure that needs to be factored in. so i would say that 13-18 is what it costs to run a skid. you also need to factor in what it costs to replace the machine, so if i run the machine 3000 hours i need 10 an hour replace it(machines go up so by the time i get there they will be 30k). so charge 60 per hour, that gives the machine 20, the replacement machine 10, the company 10, and me 20. some people think that is alot for a skid but when you do the math i don't make that great of money but i got all the bases covered, and i will always be able to have a skid with no payments.