No direct experience, but a coworker had a mini-van that had been through some tranny issues and gave up the ghost in a parking lot - would not move an inch. He did the charitable gift route, they came to the parking lot and all he had to do was meet them with the title. Got a receipt for the "market value" of the van, and they hauled it away. The donation value is tied to the tax bracket, so you might make more by breaking it down and selling pieces parts for scrap, but having it hauled off is easier.