If you followed my "Po man's carb sync tool" post, you know that I had some rather poorly synchronized carbs on my 2001 B600.
Since performing the carb sync, I've had the chance to run a couple of tanks of gas through. The result: MPG went from 42 to 48! I waited until my second fill up to post this info; I wanted to make sure the first tank wasn't a fluke.
I'm still searching for that elusive 50 mpg.....new plugs are next.