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On a lot of scooters, there is a drain tube coming from the air filter box, and another from the carburetor, both of which end up in the area of your wet spot. Both of these have some kind of removable closure on the end, check to see if still in place or loose.
You guessed right as to the vacuum...tank has to be vented... with a vent tube, or a gas cap designed to do it.
Won't really know how much fuel you're using until you have some hard numbers. Even then, one tank fill can be misleading. Click on the 'fuelly' banner in my signature, it is a neat site, if you are interested in fuel economy, operating costs per mile, etc, etc. Costs nothing to sign up. (Site is also set up to be used by those of you on the metric system)
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