Re: EEK! They've taken the sulfur out of Marine Diesel!
It's off topic, but every new version of the TDI drives worse than the last. We've owned 1998 Jetta, 2000 Golf, 2002 Jetta Wagon, 2006 Jetta and I've driven many others (up to the 2010 Sportwagen TDI). The 2000 Golf was the best handling of the bunch. My wife's 2006 Jetta is comfortable, but I think it handles pretty poorly.
5 gallons of diesel on a sailboat per month seems like a lot, you must get to enjoy a lot of time on the boat. I mostly use the engine to get in and out of my marina (~10 minutes at a time) and it can take me 6 months to go through 5 gallons of fuel. It's long enough that I don't remember if Shilshole still sells 20% biodiesel or not (which has great lubricity, but don't use it in VW TDIs newer than 2006).
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior