RFCRD wrote
Quote:
There are actually refining standards, more a question of the refiner meeting them. The variety of the oil base stock will effect the finished fuel. As with D2, cleaniness, freshness, storage, etc.. also play an important role. I find it interesting how home brewers usuing WVO base stock usually report very good results running B100. One would assume the base oil stock has a blend of oil fats by the time it becomes waste oil. Might just produce a superior product when compared to virgin oil stock.
I think the nail has been hit on the head. in the course of it's life in the fryer the veg oil picks up a lot of longer chain fats and tallows, these longer molecules have a higher energy content than pure soy oil. I have noticed the same phenomenon from my homebrew B-100. The only thing that gave me higher mpg was 100% coconut oil bio (31 mpg). A friend of mine was given a 55 gallon drum of coconut oil, so of course we had to see if we could make our diesels smell like pinacoladas going down the road (yep). Try explaining that to the cop though.
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