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2) If you use the WVO or homemaid Biodiesel in your own vehicles and never sell any to anyone, how would one ever know you arn't paying the road tax?
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Thats currently kinda a "Dont ask, dont tell" policy. Its not for a lack of trying, some ppl have actually TRIED to pay road tax on their homemade fuel, but the different taxation depts either didnt have the forms, or didnt want to deal with it.
Even the states that claim to go after bio-diesel taxes dont always have the paperwork, the instructions, or the code to enforce it.
As "commercial" fuels approach ever higher costs, You can bet the states are going to stop turning a blind eye to the homebrewers and go after them very soon.
Solution? Tax yourself. Everytime you fill up, put the correct amount of "tax" into a piggybank somewhere and RESIST the urge to raid it. *IF* you ever get dinged, you will have a nice little kitty stashed away to take care of the bill.