I cannot speak from experience, but the possible problem with this method would be cold thick fuel on startup. Once everything is warm, probably no real problem. The specific gravity of your fuel should be appx. .82. This should keep the viscosity within decent parameters. Last year I was driving an E350 (12mpg) a long way and didn't want to spend the $ to fill up (diesel was $5 / gal then). I did a little test of mixing well filtered and dry WVO with 20% gasoline. Viscosity was good. Poured test strips of different mixes on the ground (D2 -- bio ---straight WVO -- and assorted blends) and set them ablaze. The 20% mix burned about the same as D2. I drove a long long distance on pocket change. Seemed to work just great, but I feel that I was taking a chance of engine damage. Wouldn't do that to my MB, but the E350 had a total cash value of little more than a couple of tanks of fuel.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln