A few other ideas...
Make sure your pilot screws are set correctly and that your carbs are synched. The other things are maintenance items such as make sure your air filter is clean, your chain is adjusted properly, and that your brake calipers are clean and operating properly. This is just SOP - dirty air filter, dragging brakes, and chain adjustment can all have an effect on your mileage as well...
Oh, and when you wave to other riders, keep it low and close - less wind resistance.
