In Maryland, marine diesel is definitely cheaper by about 20-35 cents per gallon (Still not worth the risk of fines; plus it's hard to pull a car up to the dock

). The Chesapeake Bay is approx. 200 st. miles long and I would guess that you could find diesel fuel every 5-15 miles anywhere along the main part of the Bay at some marina. Thus the competition must keep the price down. I've been putting fuel in my diesel powered boat for 16 years and never once had to worry about finding diesel. Come to think of it, it's probably easier to find diesel for the boat than it is to find diesel for the SDL! But, I don't doubt your comments about Mich.. While visiting in-laws (by car) in Mich. over the years, I sometimes make side trips to marinas to see the boats. (Only boat nuts, like myself know what I'm talking about!) I remember that the slip fees at marinas up your way were really pricey as well as winter storage rates. - - - But, this year, there won't be cheap fuel anywhere, land or sea.