Navy Biodiesel

I bought Madeline, my 1982 Mercedes diesel, with the intention of running her on fuel from the Baltimore biodiesel co-op.  They offer 100% biodiesel at a self serve pump located outside a repurposed mill space a couple of miles south of my house.
But since I bought Madeline in the fall of the year, and I'd heard that there were issues with biodiesel gelling in the winter months, I decided to wait til spring to join. In the spring, I attended one of their meetings and learned that the membership paperwork was handled through the mail.  No problem, I thought, I'll just send it this week... but for some reason I just could not get that $100 registration fee sent. The check has been written for months, and now has become a seemingly permanent resident of the folder that holds my "to-do" paper work.

 In the interim I have fueled Madeline with 20% biodiesel available at US Navy Exchanges or regular petro diesel.
It was convenient to use the Navy biodiesel when I was teaching near Annapolis. The college campus where I worked was located near a base where the Navy Exchange sells alternative fuels- not just 20% biodiesel but gas with ethanol, too. The alt. fuels are the only thing a civilian can buy at the Navy Exchange-- no beverages, no snacks, no nothin' else without a Navy ID. Which I don't have.