around VA Beach
Always looking for a serious partner to sit down and work this out. . .just throwing this out there
May I ask why your currious?
I've heard mixed reviews about biodiesel. It's more of a solvent than regular diesel, and therefore tends to eat the rubber and seals in your fuel system. Straight vegetable oil is preferable to biodiesel; it's a lubricant, not a solvent, and I think has a better power density. Sites like www.greasecar.com will have nice articles on veggie oil (finally, a use for soybeans!).
I'd check the FTE Powerstroke boards and ask them about biodiesel before I'd put it anywhere near a Powerstroke. Diesel fuel injection systems have gotten more complex and less tolerant over the years. An old Mercedes will run fine on filtered, heated chicken fat. I don't know about a PSD. It used to be that the American diesel injection pumps depended on the lubricity of the fuel to lubricate the pumps, just like leaded gasoline lubricated the valve stems in old gas motors (German engines, and some newer engines use engine oil for the pump lube). You could destroy an intolerant diesel by running the wong fuel in it.
That being said, BioDiesel claims to have a higher power density than #2 diesel. You'll see an extra few mpg and more power. I don't know what Biodiesel sells for. #2 dino diesel is 20-cents cheaper than 87 octane right now.
Will BioDiesel become popular and readily available?
There's no large-scale commercial infrastructure for biodiesel (yet). Consumers are still willing to bend over at $2.71-2.79 a gallon for DinoDiesel, and even more for gasoline, so theres no impetus to mass-produce biodiesel. There'd have to be a real crush on fuel, or a trucking industry revolt to start producing biodiesel as a supplement to the DinoDiesel demand. The consumer diesel market is comparatively miniscule. Diesel fuel is cheaper to manufacture, and is an intermediate product of the gasoline production process. When diesel fuel gets impossible to produce, so will gasoline. Anyone using oil (#2 diesel) to heat thier homes would go to natural gas/electric. Meanwhile, PROCalifornia and some others have declared diesel "evil". High diesel prices/lack of diesel would just be junk-science proof of "just how bad diesel is. Good riddance". And gas hybrid sales would soar. (Everyone should carry around one ton of corrosive battery acid. You better hope to die on impact, 'cause you'll suffer long and hard with half your skin chemically burned off.) I do think that after a year or two of many diesel models on the market, that they'd catch on, especially if good fuel was available to allow use of the latest diesel technology. Especially if they bring over the 60+mpg compact cars (4-door Civic-sized) from Europe.
Then you have two renewable options: biodiesel and ethanol. Biodiesel appears to be superior to DinoDiesel. Ethanol is a wash compared to gasoline; Ethanol has a lower power density than gasoline (-20%), but very high octane (110). So you add a BIG turbo to increase the combustion efficiency, and you get a net power density similar to gasoline. The future is small engines with big turbos. Ethanol also burns very clean, as does biodiesel/vegetable oil.
I hope biodiesel/SVO wins out in the long run. Diesel-cycle engines are inherently more efficient than Otto-cycle engines, and lack an ignition system to control and fail. I got 28.5mpg driving my 4000lbs diesel station wagon on the interstate, and driving it HARD.
My .02
Always looking for a serious partner to sit down and work this out. . .just throwing this out there 
Stu




