Some engines don't care what gets burned - a carbon chain is a carbon chain!
Used fryolator restaurant grease is often collected for re-use as a component of livestock feed (it can't be flushed down the sewer - plays havoc with the wastewater treatment plant).
This is weird, but I just saw an ad in a nearby town advertising "soy fuel" for heating oil burners. This alternative fuel stuff is really starting to take hold.
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