I ride my PCX150 at 90 kph for 40 miles every day in all weather. Including 5km each way on the super highway at top speed -110-115kph. There is a trick to the trade of riding any motorcycle in windy conditions.
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http://ecomodder.com/forum/284575-post109.html
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If you tuck down to get your upper body lower and anchored to the bike you will discover the bikes ability to automatically self correct for cross winds. The PCX can be very comfortable to ride this way if you remove the seat hump so that you can slide back on the seat and make a tripod with your elbows resting on your knees. Winds are a complete nonissue for me on the PCX which is one of the worlds greatest performers in price/ efficiency/ and all around multi use performance.
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I also added the givi mid windshield and tilted it back and trimmed the top so the when I am riding in the lower position I am peeking just over the top so as to get the blow dryer effect where rain drops bead up and are blown staight down and off of my face shield for perfect vision with no wiping.
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My tire vibration was vastly improved by installing 50 gm balancing beads in the wheels.
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Any of the larger scooters will lose 20% fuel efficiency to the excellent PCX.