Re: better mpg with 17T front sprocket??
Manufacturers usually gear sportsbikes to pull top gear to about 5-10% short of _actual_ redline (not the redline shown on the tacho) to allow for tail winds and drafting although sometimes they over-gear wildely to keep the revs down for noise testing - SRAD GSXR's for example.
Lowering the gearing also lowers the mileage on your odometer so you have to calculate your economy with that in mind.
44mpgUS is around 18kpl I think which is pretty good for around town and 30% better than my 929.
For the cost of a front sprocket just try it. If you don't like it you don't have to keep it.
"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder