Well with a search you will see several threads where this has discussed the pro's and cons of the various systems....

and determine what suts your needs and driving habits best....most are not a one size fits all. Thats why I commented as I did....

WVO for a person who makes mostly short trips is a bad fit as are single tank blends for someone north of the tropics...lot of variables need to be considered.

I myself prefer to go the Biodiesel route due to multiple vehicles and short trips...but that requires far more work...I am prepairing to build a prosessor as soon as I can get the components to do so.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche