Not riding a motorized bicycle yet, but am using a 4 stroke scooter to get to work everyday. The scooter goes through a tankful of gas every 2 weeks with some leftover. My motorized bicycle is still in the planning stages plus I still need to sell off a couple of other scooters I'm not using anymore.
We've been having a long run of "tourist" weather for the past year or so. Makes for very pleasant year round riding, only having to use a windbreaker or poncho for the occasional morning "blessing".
I've not had to ride in a total downpour in the 3 years I've been riding a scooter to work.