My Bird is a 1700, shorty TORS, less restictive air filter, under seat mods, no cat and dynoed.
Just did a weekend ride of 802kms or 501 miles. I averaged 5.82 litres per 100 kms or 52.96 mpg. Mixture of highway and urban with hills thrown in. never went over 110kmh or about 70mph due to lots of boys in blue.
It is the best I have ever got. I run 98% Octane and the bird hums along.
Around town, riding like I stole it I can cut those figures in half.
Just out of curiosity. Aside from the Air Filter, what other mods did you find to make under the seat?