Adding Cooking oil to (GAS) boiler

This would give some form of over flow for Canola that isn't just direct to pollution. This has standing in real life as used cooking oil has been successfully converted to run industrial steam engines, such as the Grand Canyon Railway's "French Fry Express". However I do not know what values to use to keep it balanced.

It could have a high exhaust value. But it could be maybe more usefull to be convertible into animal feed.