FWIW...
I usually get less than 10 mpg during typical winter driving around town.
Granted, even though I'm typically driving on ice glazed mondo tundra, I still have an incurable lead foot...
What can I say...I love to feel like Ken Block when sideways is an option on any given corner. I also love being able to kick MAJOR ash from one light to the next, on whatever vehicle chooses to become the next victim...
That being said, on last weekends road trip with Hunny Girl, we averaged nearly 14 mpg on winter blend fuel, & most here know that I've committed every mileage "sin" there is to commit...
I'm expecting the usual 13-15 mpg on the road to Moab in May...with tool/tire trailer in tow.