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for Ryland: I'm afraid to look at B100 prices now. I almost drove by my local retailer of B100 to see the current price on the pump, but it would have added 10 miles to the trip, and I wasn't going to buy any that day anyway. The price will be higher when I do have to get some as my home reserve is depleted, so why check now?
I have been glancing at petrodiesel prices as I drive by those retailers, between $3.799 and $4.089 in my region this past weekend.
For SD76: Yes, BTU content per gallon is less than with petrodiesel, about 5% to 10% lower depending on who's calculating. I saw about 7% lower distance per gallon on the last car I ran long enough on petro before I advanced to bio back in 2001. Interestingly, the slower burn rate of bio produces MORE power at lower rpm where the expansion within the combustion chamber has more time to work at pushing the piston down. Nearer to redline the slower burn rate can't keep up with the descending piston and torque drops. This was seen on my back to back A-B-A trials on a dynamometer. The result is more power (less fuel for same power) at 2000 rpm and more fuel (less power for same fuel) at 4000. Since I drive around 2k rpm (60 mph more or less) my fuel economy loss may be less than other drivers'.
for RoadWarrior: My experiensed with ASTM certified Biodiesel have been positive. I've yet so suffer any more than gelled fuel lines when I push the cold temperature limits of the fuel. Anyone like me that tries to run B100 at 25F deserves to gel.
for smay665949: Fuel from a fossil fuel is still a fossil fuel. The gas-to-liquid (GTL) process of creating diesel fuel is still a petroleum product. It is more energy intensive than extraction of traditional diesel from crude and has an even lower energy balance.
The "coating" on the fuel tanks is the dirt and sludge of petrodiesel from prior use. Biodiesel is a fuel system and injector cleaner that may be too much if used in a vehicle with many, many miles of petrodiesel use. However... Even 150k miles of previous owner's petrodiesel use wasn't enough to create a "coating" on my wagon's fuel tank that another 10k miles on the same fuel filter following my cold-turkey change of its diet to B100 caused any filter clogging.
Biodiesel has far superior lubricating properties to petro diesel. Sulfur is an additive in metal cutting fluids. The reduction from 500 ppm to less than 50 ppm in the current ULSD has reduced the abrasiveness of petrodiesel. 500 PPM diesel is more abrasive than 50 ppm, and 50 ppm is more abrasive than 0 ppm biodiesel.
for Wazabi: The other chemical changes in petro diesel as a result of the sulfur reduction to less than 50 ppm remove the components that had kept the old seals swollen. The seal leaks aren't directly a result of the sulfur reduction, but a 'side effect' of the removal process. Biodiesel has properties that reduce, or can arrest, seal shrink.
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. There is a 60-70 cents a gallon difference between gas and diesel. Kinda make its hard for me to pay the added price for the diesel motor... I dont think It would ever pay itself off with that difference. Sorry for the rant 
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