Thanks for the info. Another person suggested that I had bought biodiesel that wasn't properly dried. I'm guessing that since you make your own you are confident that you are thoroughly drying the fuel? I don't know what to think anymore. Why do yours and mine and only a handful of others...

I have an 07 CTD. I run B20 regularly and have tried B100 a few times. I get 14-15 around town and 17-18 or a little more on road trips. When I have run the B100, I notice maybe a .5 mpg less difference. My driving habits are too varied to notice much more precise mpg changes. Although not yet proven...