The previous post matches my experience. It's all about how fast you ride, with significant input from how heavily (i.e., non-aerodynamically) you're loaded.
My dl650 gets 5 miles per (US) gallon better than my KLR650: that's the advantage of fuel injection and an extra gear. The difference remains constant for changing loads, headwinds, speeds. In normal use, that translates to 55 mpg on the DL, which is actually quite similar to what Traveling Strom writes above, since (I happen to know) he rides faster than I do.
Recently--for the past 6 or 7000 miles--I've been toodling along at a steady 50 miles per hour on my KLR; I'm trying to coax it home from South America, and it seems to appreciate a leisurely pace. I'm getting 65 miles per gallon at that speed, fully (over) loaded, compared to 50 mpg at higher speeds. I don't know if I'll ever go so slowly for so long on my DL, but I'd expect it to get even better mileage if I do.
Mark
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