Maxim. Spend a little more and get my bx2230 that you don't have to do anything to . AND , it has an rops with canopy and a front end loader. And a 54 inch deck, AND fully serviced with all synthetic fluids. There's more (AND"s), but you get the picture. It's in the classifieds here and on craigs list(Chattanooga Tn).
But to your original question. My wife has a Bad Boy 60 inch 30 hp gas zero turn mower. In 1 hour of mowing, my bx diesel will use 1/2 the fuel her's does. I have specificly done a test to verify that.
Your tractor would be perfect, and I really wish I could buy it from you, but my max is right around $5000, and even that is a tough sell to my wife. Thanks for mentioning it though!