Most commercially available Bio-diesel will be a blend of B20 (20% Bio-diesel).
Bio-diesel has actually been around for around 100 years but the cheap availability of Petroleum fuel has made it the choice for Diesel fuel. But now that petro-diesel prices have risen to such a high level, it's becoming affordable to use Bio-diesel. And it's becoming very popular in MANY countries.
A History of Bio-diesel –
By now you've no doubt been hearing about Bio-diesel from your friends,
or family, or maybe Television, newspapers, the Internet etc. Bio-diesel
is in a large growth stage right now because of the rising costs of Petroleum
based fuels, the emissions from petroleum-based fuels, the realization
that our oil reserves wont last forever, etc.
Here are some sales volume estimates for the US from the National
Bio-diesel board -