My prices are set to cover my costs and generate a profit; this includes the fuel. Not hard to figure out; note the tank size of your mower, fill it, mow property, eyeball what's left in the tank. Multiply by the price you paid for fuel, and you've got your fuel cost for that property. If you don't already have an idea, after you've run a piece of equipment for 10-20 hours, I'd say you *should* have a decent idea of fuel and oil usage for an hour's use. Keep in mind you've got some fairly predictable costs, other than fuel and oil, for operating your equipment. Things like air filters and spark plugs usually have replacement intervals specified by the equipment manufacturer; so every 20 or whatever hours, Toro or whoever says you should put a new widget in. That widget has a cost, and you can easily spend a minute or two with a calculator to figure out how much that maintenance item costs you per hour of using the mower. If you're not a small engine mechanic and are paying someone to do the widget replacing, back to the calculator to figure what the guy charges you for widget replacing as an additional cost per hour. When the phrase 'know your costs' is thrown around, this is the kind of thing it means to an LCO. If you take a job that will have you spending an hour running a tractor or a blower, what did that hours' use of the equipment cost you? If you don't know, it's harder to set good prices to cover the cost. Sure you can fudge it by pricing higher just to avoid some math, but if a customer balks at your number, there goes that job. If a customer balks at your correctly set number, either your price isn't competitive, your costs are too high, or that customer wasn't a good customer for you. I've quickly learned, and have seen mentioned repeatedly in threads here; there is no such thing as "any customer is a good one".