I find it costs just as much to build a good biodiesel processor as it does to do a good WVO conversion on a car. Methonal goes boom real easy, I do not like that part. I have made biodiesel and it takes longer to do the titration then it does to filter the oil. I average about 10 gallons a day filtering for the last 5 years.

I have seen single tank conversions and the truly best ones have a water injection system also. A local greaser has a 99 300 turbodiesel it uses the glow plug delay and lower pop pressure injectors FPHE and electrically heated fuel filter. And water injection system. And this is south Florida and he sometimes adds a little diesel to the veg oil so it will start in the morning when it is cold out.

I have tried blending and it does not start right and you have to buy fuel to do the blend, once it is converted it is done. Greg's 07 ML converted to WVO is a work of art!

For those that think blending or single tank conversions are better for around town use. My wife's Jeep CRD is now driven locally more and she is still getting over 100 miles for every gallon of diesel fuel purchased. Her fuel costs work out to about 4 cents per mile. Which is similar to my calculation for an electric car.