It has been a while since Anthony Watts posted the following remark on his blog:
I’ve never much thought there was much usefulness to waste vegetable oil used for automobile fuel, as there is a much more finite amount of waste frying oil available compared to petroleum. Ditto for chicken fat powered aviation. Would you want to fly on a plane that is chicken fat powered? Personally, it seems clucking ridiculous.
I just wish NASA would stick to space exploration.
Watts is complaining about an article posted by NASA where they explain an experiment they did with alternative fuels. And for this experiment they used chicken fat and beef tallow as the source for the fuel: