we dont put ANY rocks thru the chipper. will kill your knives immediatly. like taking a chainsaw to concrete. wet leaves are dirty leaves, and dirt is just as bad. if you do put the rakings thru, run a couple pieces of wood thru at the same time, it saves on clogging. hardwoods i put as little wood thru the chipper as possible. im talking 3-4 inches on a 14 inch machine. youd be amazed how much of a difference the is between a maple and a pecan. i dont know where your at but if your eating up pecans like that you might be on oklahoma huh? pecan is EXCELLENT fire wood, especially when you mix it with ash. im sure saving as much would as you could would be a good thing. sell the stuff by the load in whatever lengths it leaves the tree. sell it to the firewood guys or even run a ad in the newspaper. if they need it cut to firewood length do it after you dump and chargem extra.