It's cold - air up your tires.
#51
AudiWorld Super User
A few articles on the causes and effects of winter temps on fuel economy:
https://www.fueleconomy.gov/feg/coldweather.shtml
9 reasons why your winter fuel economy bites! - MetroMPG.com
Why does mileage drop in winter? - Autoblog
https://www.fueleconomy.gov/feg/coldweather.shtml
9 reasons why your winter fuel economy bites! - MetroMPG.com
Why does mileage drop in winter? - Autoblog