I am at the point where I am even considering selling my 1996 Honda VFR 750 for a smaller bike to get an extra 5-10mpg. Kawasaki just revamped their baby Ninja, the 250R and it not only has improved styling and performance over past models, it will average 50MPG and a new one can be had for $3500 which I know I can easily get for my 1996 VFR 750.
The Mustang is killing me on my daily commute, I average 20MPG and that works out to $15 per day for me. The VFR has 4 carbs and keeping them synched is a pia and it has been averaging 40MPG. As much as I love my VFR, the little Ninja is looking really attractive at this point for my daily commute.
2008 Kawasaki Ninja 250R Review 2008 Kawasaki Ninja 250R - First Ride - MotorcycleUSA.com 