I'm halfway through a first tank of B20 and so far the only noticeable differences are the absence of visible smoke on hard accelleration and a lack of odor when idling. Accelleration seems to be slightly slower but there's no way to tell since I'm not timing anything. Also, there is significantly less noise at idle which seems odd, but I'll take that as a plus.

Next is a MPG test for in-town driving and then a road trip later this month.
According to the vendor on Long Ave. in Fort Worth, the biodiesel cleans your
fuel system as you drive, so theoretically the fuel filter would need to be replaced sooner than later depending on how much cleaning gets done.
Anyone with long term experience with B20 in a similar car?

Steve