These fuels require expensive engine modification and special storage arrangements. Bio diesel does not need special storage or engine modification. A very positive energy balance. For each unit of energy put in to the process, at least two units are produced and four if the straw is used as a fuel. And this energy is in a readily useable form - oil, almost straight into your diesel tank.
Emissions are far better overall than from fossil fuels.
The carbon is re cycled and on balance other emissions are as good or better than for fossil fuels. Bio diesel is renewable and sustainable. Fuel year after year from our own fields. It is safely and easily biodegradable thus safeguarding our rivers and other sensitive environments. It is safe.