I put over 100 miles on the bike today and over 160 total since changing the brass. I've only checked mileage once, but I got 39.3 mpg. It took 2.2 gallons to fill up and I never got to reserve.
The bike is running great. Starts easily, idles well (although I have noticed that the idle is ~100-200 RPM higher sometimes when it's in gear and the clutch lever is pulled in....idles at ~1100 RPM in neutral), and pulls well in any gear.
I'll pull a plug or two soon, out of curiosity.