In article .net,
Lew Hodgett wrote:
Somebody wrote:

Have you ever run the numbers on how much biodiesel one can produce from
an acre of farmland in a year?

Why waste time with farmland when you have all the used oil drom those
deep well fryers at the fat farms of the country such as McDonalds,
Burger King, etc, available?

I dunno. maybe because the oil in those fryers -- at maybe 5-10 gallons
per site -- typically gets changed far less often than once a week.

Assuming there's 1 such fryer for every 10 people -- I have no real idea,
but I suspect its more like 1 per several hundred, if not thousand -- that
source will produce an average of 1 gallon/week per person. This isn't
exactly a significant dent in usage.