Can't tell where you're from but, if it's cold this time of year where you are and you ride in the cooler temps, you'll have a noticeable drop in mileage versus warmer temps. I experience this every winter. I ride to work most nights of the year. It's noticeable when temps are 40 degrees or lower and even more so when temps are in the 25-35 degree range. Mileage will jump back up to the 40's when it warms up.