Looking at the instruction manual for running a crematory might provide useful information as would investigating modern Hindu funeral practices. Burning one body at a time is different than burning thousands at a time but both involve combustion of bodies so some insights might be had.
These are valuable comparisons. Of course, the case of crematory ovens takes us onto a new subject, which is a good direction for the discussion to develop, but one that needs a focused presentation of its own, since cremation in an oven is significantly different from open air cremation. For the moment I'll stick with open air cremation.
Regarding Hindu cremations, here are some sources on fuel consumption:
Arnulf Neumaier's article
The Treblinka Holocaust, published in the anthology
Dissecting the Holocaust, cites a November 27, 1986, report of the New Delhi Schenectady Gazette, according to which in India 6,433 metric tons of dry wood are used to incinerate 21,000 bodies daily. This comes to 306 kg per body.
The Fuel Efficient Crematorium, described
here gives the value of 400-600 kg for the requirements of pyre cremation. The system in question prevents heat loss out the sides - something never described for the Reinhardt cremation facilities - and is claimed to half the fuel requirement.
Even the antirevisionist website HDOT confirms the 400-600 kg number for Hindu funeral pyres.
Now, AUSVETPLAN said that burning a cow requires 1500 kg of dry wood, but economies of scale reduce that to 1000 kg in a mass burn. Taking as a hypothesis the claim that the same reduction of one third would apply with humans, we get the following estimates of fuel required per body in a mass burn:
204 kg per body based on the figure 306 kg
267 kg - 400 kg based on the figure 400-600 kg
These estimates are in reasonably good agreement with my estimate of 250 kg per body.
One thing I need to keep reminding myself is that the Nazis could run as sloppy a cremation as they wanted to run. They had no respect for the bodies they were burning. They didn't need to worry about destroying the bodies so completely that all pathogens and disease vectors were also destroyed.
Do authorities who cremate animals really have so much respect for the bodies that they undergo unnecessary expense? Regarding pathogens and disease vectors, these are not totally destroyed either. The ash (something like 120,000 tons of it, as I recall) from the 2001 UK FMD pyre cremations had to be removed from the incineration sites and taken to biosecure landfills. Open air incineration is also regarded as unacceptable for dealing with prion diseases, because prions are so difficult to destroy.
Note also that the Hindu cremations are not for the purpose of destroying disease, but they don't seem to be any more fuel efficient. You can also readily find discussion of the environmental problem caused in India by the disposal of incompletely cremated bodies in rivers. The poor are often unable to afford enough fuel for a complete cremation (and even an incomplete cremation takes a huge amount) - this is a documented phenomenon not just in the case of modern India, but throughout history. (There are references to this fact in the
Encyclopedia of Cremation and in Jacqueline McKinley's article in the book
The Analysis of Burned Human Remains.)