[UFO]

I have not done any research or testing of biodiesel blends myself, however I still find about a 10% difference between mostly pump diesel and mostly B100. My VW TDI (ALH) consistently returns 10% better mileage with B100 -- I have done my level best to calibrate distance into my Scangauge and measure my B100 as accurately as possible. That is the one difference I cannot eliminate in my comparisons since I pump my own B100 with a home-fabricated station and a gauge that measures in quarts.

It contradicts what most claim about biodiesel because of supposedly lower energy content, but I noticed a mileage drop when ULSD was introduced. I think the new diesel fuel is about the same energy content as my B100 now, so the main fuel difference could simply be the higher cetane.