Georgs and Listees, I'm following up on your recent request concerning biodiesel for marine use on the Chesapeake Bay. I hadn't received a response to my email from Sandy Davis of the Maryland Soybean Board (MSB) so I phoned her. She said that there are no marinas that she knows of at this time dispensing any blends of biodiesel. However, the MSB is going to revisit this matter during their upcoming Board Mtg. on August 13-14. As I mentioned in my first response to your initial query. There are now a couple of gas stations in Maryland dispensing B100. One of them is in Easton on Rt. 50 and the other is a Shell station in Taylorsville at Rts 26 & 27. It's a little pricey at $2.59/gal, but I blend it in my car's tank to a B35 blend each fill up. I have run the pure soydiesel (B100) with excellent results. I only blend it to save money. Anyway, the supplier to these retail outlets is Tri-Gas & Oil on Maryland's Eastern Shore in Federalsburg, MD. Any Marina that wished to offer a blend of biodiesel (say 5, 10, or 20 percent) could contact Tri-Gas and have it delivered and added to their storage tank. My personal feeling is that anyone could run up to a 20% blend and probably higher, no matter how old the engine, with no detrimental effects. The effects would only be beneficial, ie. increased lubricity, a significant reduction in soot since the biodiesel contains no sulfur, increased cetane since the biodiesel has a higher natural cetane. If you're a person that likes to add additives to enhance these things, the savings in additives could offset the potential increase in the cost of the biodiesel blend. I encouraged Ms. Davis to bring this to the Board's attention. As interest is in soy-based diesel and other renewable fuels is increasing, the time may be right for another push to get the word out and try to encourage some marina operators to offer a biodiesel blend for boaters. I, personally would use it in my boat even if it cost a little more. At a fuel burn rate of 3 gal/hr, I could handle a little bump in cost. If anyone wishes to contact the MSB for information or to express their support, their website url is: http://www.mdsoy.com/index.htm Hope this helps a little. Mel Knott Sandpiper Chris Craft West Indian 36 Trawler Annapolis, MD