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...

If high water content in the fuel is the problem, what can be done. My understanding is the fuel filter/water separator installed in the vehicle only separates water that is not emulsified in the biodiesel. (My "water in fuel" indicator does not illuminate.) Does the FASS or Air Dog system do a better...