From what I've read, funeral pyres require more wood than that. The typical funeral pyre in India uses 1000-1100 pounds of wood, and it doesn't completely burn the body. It leaves a burned body, with fleshy bits attached to a skeleton. It doesn't magically become a pile of ash. The body still needs to be disposed of. Interestingly, in all but two of the "death camps", it's claimed that's how the Nazis cremated the bodies in open air fire pits.

From what I've read, funeral pyres require more wood than that. The typical funeral pyre in India uses 1000-1100 pounds of wood, and it doesn't completely burn the body. It leaves a burned body, with fleshy bits attached to a skeleton. It doesn't magically become a pile of ash. The body still needs to be disposed of. Interestingly, in all but two of the "death camps", it's claimed that's how the Nazis cremated the bodies, in open air fire pits.