Motorcycles aren’t actually uniformly more fuel efficient than cars despite the size. Many full sized ones will actually use as much fuel as a car on commuter trips. The engines are massively more wasteful. Mopeds or scooters will fare better. Maintenance can also be costly. But really, the whole efficiency difference is probably obsoleted by using electricity instead of gasoline.
Two wheeled vehicles aren’t that useful in actual winter snow and ice. They are completely unsafe if you have to ride in traffic with cars and lorries etc. On light traffic routes, bicycles do work, at slightly above walking speed. Quad bikes, trikes or light vehicles, barely doable, but the cost and parking is as bad as with cars and weather resistance is much worse. Safety is worse, though not as bad as two wheels.
Somewhere, for someone, maybe they are an economical option, but these observations killed the idea for me. If I can’t walk or cycle, because of distance and time mostly, or use public transport, a car is the only viable option for year round commute where I live. Electric preferrably.