Forum:
As its been stated by other members, this subject keeps coming up.
But it has been a while since anyone has realy updated the subject.
Anyway.
Hoping someone can help me out.
Im currently running my fourtrak on regular diesel.
Been thinking for a while now to change to bio fuel,
Just wondering
Is it worth while 
What mix would be recomended,
Iv also noticed, people go on about veg oil and things also, there is a difference between bio fuel and the veg oils etc is there not
Cheers
Dales
SVO or straight vegetable oil
A large amount of information is available here http://www.daihatsu-drivers.co.uk/biofuel/thefacts,
but to summarise:
SVO or straight vegetable oil is just what you buy at the supermarket to use for cooking, a lot of rugged diesel engines can run fine using SVO but as it is thicker and solidifies at a higher temperature than diesel it is often necessary to have two tanks and switch to SVO once temperature is up. That being said a lot of people mix SVO in with diesel from the pumps in their normal tank, especially during warmer months this shouldn't be a problem.
Biodiesel is produced via a reaction between vegatble oil (which can be waste veg oil (WVO)), methanol and sodium hydroxide. This produces a fuel very similar to diesel and a lot of cars can run on 100% biodiesel. Again it can suffer from solidifying in colder months but isn't as bad as SVO.
Unfortunately SVO prices are now quite close the price of diesel. Biodiesel is producable at very low costs, some say as low as 20p a litre, but this is dependant on you being able to establish a reliable source of WVO from local restaurants and having the time to safely make your biodiesel. There are places that will sell you biodiesel and I think the price shadows that of regular diesel. Maybe a local supplier would be a good place to try something different and experiment with various mixes with regualr diesel.