Funny you should mention that - the top of my short list (no jokes, please) is a 6.5L GM diesel in a 28-foot Class A here in P'cola. We're going for the test drive this weekend. Slightly better mileage than the small-block V10s and big V8s. How dirty is the boat going to be when I get where I'm going? Any diesel drivers out there?
Thanks for the tips, folks - knew someone would have some good advice.