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It could be something as easy as the throttle cable being too slack so that it does not open fully at speed. You can check by taking out the seat and operating the twist grip and watch to see if the butterfly valve on the injection body goes to full open. Another possibility is to check the air filter for any obstructions. This would cause both speed and mileage symptoms that you mention. I doubt that the "chip" remedy is the answer unless the one in your scooter is defective which would be covered by the warranty. A third cause could be a dragging brake caliper which is easily checked. Put the bike on the center stand and see if the wheels turn with only light resistance.
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