Scooter or a real MC?

I’m comuting about 20 miles one way and fuel prices are killing me. Paid 427.9 for medium grade today. My Mustang gets single digit milage. I used to ride motorcycles years and years ago and still like them. Thinking of gas milage. Any recomendatios between one of the big (450 to 650cc scooters vs a real, full sized motorccle. I like the 500cc Royal Enfield best but dealers a few and far between. So I am going to go mainstream with what ever I buy.