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Originally Posted by Bruce Appel
I have been running my 85 300 sd on biodiesel for about 3 months now. It was the reason I bought the car as a matter of fact. It definately runs smoother, quieter, and with more power than when running on regular diesel.
I started by running ever increasing mixes until now I am running 100%. It ran noticebley better on as little as 10%.
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I hate to bust a few bubbles here, B100/VO will have about 10% less BTU's on average then dino diesel and there fore will not make as much power or have as good as fuel economy. The only reason you have what seems like more power is because the bio has cleaned your injection/fuel system. Once cleaned you can switch back to dino fuel and notice an increase in fuel economy and power. Been there and done that for the last 4 years with my VW TDI diesels.
I will say that in my 240D there doesn't seem to be as big a difference when switched off B100 as the new VW's have had. Last time I saw my '00 NB TDI the guy was running B100 since he bought it, and it was clocked at a 135 MPH at a GTG in MI. It was running oversized injectors and and a Stage II Rocket Chip. I had seen 130 mph without the chip and running oversized injectors and 53 cetane dino diesel, I probably could have gone 140 but the radar detector went off. All speeds verified by GPS.