Do you have to run on road diesel fuel in your mowers or could you not keep a tank on your property and let them deliver off road diesel fuel at a cheaper price? What is the price difference in on road and off road diesel fuel in your area? I keep a thousand gallons of off road diesel on my farm and I have never paid any attention to road diesel prices but I would think you could save money this way. You could have a fuel tank on your truck that you could fill up at your house out of the off road diesel tank and you would never have to fool with going somewhere to buy fuel. Gas is the same way, I keep a thousand gallons on my farm and they just deliver everything by tanker truck, you write all your fuel off on your taxes and it is a whole lot easier to keep up with what you spend for fuel this way.