Biodiesel has big potentials as alternative fuel such as eolic and sun energy.
A big obstacle for biodiesel is land productivity of actual plantations of vegetable oils.
Palm oil gives the best productivity but it is far too little to cover whole world population needs.
There are researches in algae oil production because algaes has an enormous productivity (per occupation of land) but production costs are far too high.
We can't make anywhere near enough of it to replace all petrol used.
Biodiesel
The Air Force has experimented with biodiesel in some of its airplanes - jet fuel is very similar to diesel.
biodiesel = el biodiésel
Yes it is safe to mix petroleum diesel and biodiesel. Blends of biodiesel and petroleum diesel are designated "BX." Where "B" states that the fuel mixture is a biodiesel blend and "X" indicates the percentage of biodiesel in the blend. For example, common blends of biodiesel in North America include B2 (2% biodiesel), B5(5%), B20(20%), and B100(100%). B100 is also know as "neat," or pure, biodiesel.
Wikipedia provides an excellent encyclopedia style article on biodiesel fuel. Other websites that offer information about biodiesel fuel are the U.S. Department of Energy's Biodiesel page and the National Biodiesel Board's page.
Yes, you can buy a hybrid that uses biodiesel but they are much harder to come by than hybrids that don't use biodiesel or biodiesel cars that aren't hybrids.
the biodiesel should be used in the diesel engine, and there are some biodiesel motorbike has been produced such BWM http://www.doinggroup.com/
Biodiesel's weight is generally 7.34 lbs/gal.
Just about any diesel vehicle will run on biodiesel.
Biodiesel
You often only find biodiesel in the Midwest or areas where corn is a big market. Biodiesel is made out of corn and that's why. Biodiesel will make your diesel engine get better gas mileage just so you know.