Who makes Bio anyway & Blends are not bio,
Part of the acceptance and distribution of bio is limited because BIGOIL does not actually make it. The brewers/distillers of bio are other companies that are heavily tied to the likes of ADM, Monsanto and Cargill & the like.
Here is a link from the biodiesel.org site that has good info. Keep in mind the source that is a trade group and fundamentally its purpose of marketing and publicity in mind. There is interesting reading on using greater than B20 and the like too.
http://biodiesel.org/buyingbiodiesel/guide/
The biodiesel folks will of course tell you to avoid WVO/SVO blends because they member companies don;t sell plain oil, they sell the refined product.
Do blends work? Sure and many people have done it with ok results.
Take a look at the discussions in the Bio & Alt fuel section of the forums. Lots of good info there.
Personally, I don;t like the idea of blends but that's my mildly educated opinoin.
Dennis