As FleetCarma states:
"When we released real-world data showing how the ranges of Chevrolet Volts and Nissan Leafs changed with plummeting temperatures we wanted to show not just overall trends, but how much variation existed from trip to trip."
"This time we took it a few steps further. With this infographic, our analysis focuses not on the differences within electric vehicle models, but the differences between electric and gasoline vehicles as temperatures drop. We looked through FleetCarma’s real world database to find how much the fuel economy of each vehicle changes at and below freezing temperatures. It is important to note that the specific numbers used in the infographic below represent aggregates."
Check out FleetCarma's superb infographic below: