When the cold weather hits, fuel economy inevitably takes a dive. Lower temperatures impact gas mileage in a number of ways, including winter gasoline blends, lower intake air temperatures, longer engine warm-up times (to reach optimum efficiency), increased air conditioner use (with defrosters), and idling. Keeping your car in a garage will help decrease warm-up time, as can an engine block heater. A grill blocker can help keep under hood temperatures up while you’re driving in the coldest weather. But the biggest trick is keeping the driver warm while reducing the amount of idling at start-up and throughout the day.
I’m testing a Milwaukee Tools M12 heated hoodie this winter, to see if I can reduce idling. I’ve posted the first part of a two-part video review: