On the subject of winter gas mileage; I feel certain thee is a drastic change in winterr formulation of gas in Northern states, and this decreases our MPG.
I drive a Honda Civic Hybrid, where I use cruise control all day long, running at exactly 72 MPH. On the interstate I ALWAYS get exactly 48.5 MPG, in warm weather, using the air conditioner. On a recent 1600 mile round trip out to Wisconsin, I got as far as Indiana before I needed to fill the tank the first time. As the trip went, my mileage was low to start with, then dropped all the way down to 35 MPG. My car is in perfect tune, and the only reasonable explanation I heard was the change in gas formulation for the season. Also, in the midwest, they use ethanol mixed with the gas, and in Wisconsin, they have further additives for EPA reasons. When I got home, my around town mileage returned to normal.
On my Blackbird, I found that by using 87 Octane, I was running badly and getting terrible gas mileage. When I started using 93 Octane, the bike ran much better and got more normal mileage.