I run a blend in my cars, and also make biodiesel for my home furnace.

The blend is from taking the best oil off the top, filtering it, mixing with about gasoline (about 10%), and running that in two Mercedes. Cost of the filtering system is about $60.

The not-so-good oil I pour into my biodiesel reactor. I used to titrate each batch, but my numbers came out the same so often that I just use a typical amount of lye and about 18% methanol, and I'm good to go. For BD, it takes about $500 to get started, and you need 110v, fresh water, and compressed air available.

The blend has gone 45,000 miles in two MBs and also powers a diesel generator to occasionally get off the grid and have a true low-fossil house.

I haven't tried the blend in the house boiler yet (it runs all year for domestic hot water), so it gets washed and dried biodiesel.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k