These leaves used to be in the 6 oaks dotting our yard. They come in handy cooling the house; our a/c bills are small. I figure it costs about 8-10 hours of gathering in the Fall.
I'm not supposed to blow 'em in the ravine, so I store them in front of the house and dispense them to Rumpke 5 containers at a time. In the meantime, I'm hoping no one hits the pile with their car.