Hi geewizztoo, I also own a 405 SRDT and have tried B100. Living on the Central Coast I picked up a few tankfulls from Hexham Bogas when they were trialing it publicly.
Unfortunately my results were not quite as good as yours. After the first tankfull I noticed an appreciable loss of power and accelerator feel. Though torque appeared to be increased. But, there was no black smoke. I drive 80k's a day to and from work, 14k's an a main road, 24km on a 90km/h backroad and about 28 k's on the F3 (110-120km/h indicated on the speedo...though it is about 6% optimistic) plus an occasional shopping expedition. Average fuel consumption on mineral diesel is about 6L/100km. It goes too 6.5 -7.0 when I'm in a hurry with no regard to fuel usage, and about 5.3 when I take my time and use BP fuel (yes...brand DOES make a slight difference in my car though the difference was greater before the recent introduction of low sulphur diesel). The best consumption ever was across the Hay Plains with my wife driving when we averaged 4.8L/100km. On average I get about 980k's out of a 60L tank before the fuel warning light comes on properly. HOWEVER, I have fitted two Spiralmax Turbo twisters in the intake, and a Turbo exhaust Tube fitted to the exhaust. These have definitely improved things fuel consumption wise.
Unfortunately B100 increased my fuel consumption to between 8-9L/100km consistently. B100 did clean all the built up dried spillage from around the edges of the filler cap and overflow tube, and it also went well on the barbie when we ran out of cooking oil...but that's another story.
One fascinating thing I noticed was what happened inside the exhaust pipe. Over about 5 tanks full, it removed ALL the built up deposits of carbon (some as thick as 2 mm) from the inside of the exhaust pipe (near the bends in the pipe) and left only a thin layer of ash that did not build up again. So I firmly believe in it's cleaning abilities. Also, there seemed to be a substantial reduction in the amount of soot buildup occuring to the engine oil.
When Biodiesel becomes available on the Central Coast I will use it but may have to play with the injector timings to get some power and economy back.
By the way, my brother has an 80 Series Landcruiser and his vehicle thrives on B100, so every manafacturers' vehicle is different.

ps It was also a bit quieter using B100, not so much clatter coming from the motor.