Your claim of 80-100mpg puts a lot of people off. Its a straight lie and you know it. You can try to justify it any way you want to but the fact remains that you're only getting 22mpg. Whether that fuel comes from a diesel pump or a restaurant is irrelevant. The long term costs of running SVO far outweigh any savings at the diesel pump. I hope you enjoy rebuilding the injection pump, injectors, replacement fuel filters, clogged fuel lines, combustion chamber deposits etc. Its not a matter of if but WHEN it will leave you on the side of the road with a huge repair bill.
Guess which injector has been running on single tank WVO?
More WVO fun
And while we're at it, you should read this.
http://forums.tdiclub.com/showthread.php?t=186108