Have you checked for a fuel leak anywhere on the bike? It could be a slow drip.
How consistently do you fill your bike up with gas? If you fill it on the sidestand, you might be putting in less than if you fill it on the centerstand.
I agree that your riding style has gotten more aggressive, but I doubt it would cause such a sudden drop in mileage. Have you been riding at a higher speed on the highway, however?
Were this my bike, my next step would be to inspect the airbox and the carbs.
(I also hit about 180 on my EX500 before switching over to reserve in mixed city/highway riding.)
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