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Old 04-04-2012, 09:14 PM   #11 (permalink)
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Join Date: Jun 2011
Location: Portland, OR
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Jogger Fogger - '07 GMC Sierra SLT
90 day: 13.62 mpg (US)
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I think there's a little confusion here about the cost of making biodiesel vs. ethanol.
Making biodiesel or WVO from free used cooking oil is very cheap. $1/gal?

Making the un-used cooking oil is much more expensive.

If you had to make the oil from raw products, then refine it to biodiesel, then it would be $8+/gal.

To answer the OP's question about MPG and biodiesel; yes, it's not as good as petro diesel. I've seen 1-5% worse and 4-10% worse. Lots of variables there. I've been running B100 for 6 months now and B99 for 2 years before that and my driving style blocks any good study, but the difference is marginal. I know marginal is what hypermiling is all about, but once I started making my own fuel, I cared less about MPG and more about that cool smell that followed my truck around.


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