As a followup to this post I calculated the gas mileage for my most recent tank of gas on my motorcycle. It was 41.2 mpg this time. A little better than the 39.7 before, but still way below what I was hoping to get from a motorcycle. And this is a relatively small bike, with a 550 cc engine. I could get almost this good of gas mileage from a used Honda Civic, and carry 3 passengers or groceries with me. Hmm….