Why have you drilled out the adjustment/pilot screws? This will no doubt be causing the rich running at idle.
Anywhoo, a B6 should average about 45 mpg (british) through stop/start riding, and about 50-55 on a long highway run.
Rev wise with standard gearing, I get bang on 5k revs for 60mph, and this is the norm.
Hope this helps somewhat,
Bullet5.