This was a comparison of diesel fuel lubricating additives. Lubricity is very essential in diesels (injectors and injector pump) since switching to ULSD. However, I thought it should post it in the general fuel economy discussion because I believe the best performer B100 could be added to gasoline with little or no side effects.
Any HFRR value GREATER THAN 520 HFRR is a FAILING grade for lubricity...
I ran into a report by the military in which they conducted a study as to which biodiesel provided the best lubrication enhancement. It seems Ethyl Castor biodiesel was the best as with JP-8 fuel with 1% Ethyl Castor biodiesel in it brought the HFRR score all the way down to 165.
I have put new vegetable oil and new canola oil directly in my gas tank. I've done up to 32 oz of NVO in a 16 gallon tank. Noticed no dramatic difference in performance, but I might have not had some of the cold weather mileage drop. Was hard to give great data on the project.
I have to travel to find B100, but vegetable oil and canola oil are available very, very easily.
Used vegetable oil usually has some water absorbed in it and food small food particles. I heard of a guy using toilet paper roles to filter used vegetable oil, and I suppose you could heat the vegetable oil up in a clean pan to help evaporate some of the water out. I've ran some new vegetable oil in my 4-wheeler before and there wasn't any noticeable difference in performance wise. Only difference was the exhaust smelt like when you fry french fries. Smelled good at first, but then it started making me sick after a while.