we use straight fryer oil (filtered only). To me "biofuel" is just adding lye (is it?) diesel, etc. They're puttin ina plant 4 it here. We cheep out, triple filter down the hill like above, start/stop (just 5 min) on 1 tank (diesel) an run on tuther (used, filtered, straight fri-o-later veg oil) to keep lines un-jelled. Smellin like a Chinese restaurant is beddah than a dead dinosaur, cheeper, not so tough on the environment (mining AND burnnin). Mr Diesel (dat ol German) ran his 1st motor on soy oil too.
Next step up would B a cooper coil in the fuel tank that runs the water jacket coolant thru there. Thousands of vegie cars round here run that way (since mid '90s). Most often seen round here - that million mile MB 5 cyl motor (is it late 70s - mid '80s?), next is the VeeDubs. Fewer trucks but we're a more conservative group...