Has the jetting in the carbs ever been messed with? The bike could be running rich. Do you need to use choke to start the bike when its cold?
Also, how hard are you accelerating from a stop? Try not to accelerate any faster than cars around you do. Try short shifting to keep the rpms as low as possible.
How fast are you going on the highway? Are you tucking down to make things more aerodynamic?
Whats your tire pressure at?
Just to give you an idea.... my ducati 900ss/sp gets around 47mpg if i baby it. My Ninja 250 has averaged 72mpg since i've owned it.
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