I have now owned my KLR for 20 weeks...and I just rolled 7000 miles...7006.1 to be exact. That comes out to be just over 350 miles per week. There have actually been a total of at least 3 full weeks that I haven't ridden due to travel, a hurricane, etc. Using 17 weeks of actual riding puts my average at just over 412 miles per week...which is more accurate.
Over the 20 weeks, I have averaged 51.2 mpg...with my most recent averages being in the 53 mpg range, and my best (and most recent) being 54.1 mpg. As for miles-per-tank, I normally get in the high 230s to mid 240s...with one time at exactly 250. Also, I have not yet spent $500 (total) in gas.
Not too shabby...I couldn't be happier!