Hi chap Ive been there and done that in the long run its not worth it. You don't get a good return.
Sorry i couldn't`t help more.
i beg to differ mate, im on 100% bio diesel, 45mpg,i make it out of used cooking oil,it costs me 15p/litre to make,(68.25p/gal) it works out at £00.01.52p per mile(yes thats right one and a half pence per mile), recently i done a 195mile round trip and it cost me £2.96p. i'd say it was worth it.
my tank holds 50litres so to fill my tank it costs me £7.50 as apossed to £53.95, which is a saving of £46.45 every tank full
biodiesel is a differe