Main tank is 3.4 USgal.

If your math is right you're getting 12mpg.

I have a heavy hand, and get 25-33mpg, one of the lowest here.

Either your math is wrong or somebody's siphoning your tank.

Steelheart- '03 Speedmaster Black/Yellow The Hayabusa Killa 16" Shorties/140 mains/Airbox drilled Procom CDI "There is no cure for Celibacy. But we can treat the symptoms."