Thanks - was unaware of Winter Mode! Hasn’t really gotten that cold here yet, but will check it out. Assume it must be manually selected, or does the vehicle auto select it if temperatures are low enough? Surprised you saw that much degradation in the Tesla at low temps- have read that their batteries are the least impacted by cold temps of all of the EVs out there…talking to friends with late model Tesla 3s and Ys they seem to agree that temps have little impact on their range. We seldom get subzero where I am at however.
Range loss has nothing to do with the battery. It’s a myth that won’t die, which is why I’m always that one dude on every forum pounding the desk and shouting about it. Perhaps I should settle down. 🧐
It’s all about increased energy consumption because of the colder conditions. Batteries sometimes need energy to be warmed. It takes a lot more power to heat the cabin than it does cool it down, and the colder air is more dense which increases wind resistance. Snow and ice also effectively increases rolling resistance because you’re having to push the snow out of the way with your tires as you roll over it.
My Model 3 didn’t have some of the energy saving wizardry that my EV6 does. It had single-pane side glass and a glass roof that didn’t insulate as well. It exclusively relied on a PTC resistive heater to heat the cabin, which is less efficient than my EV6’s heat pump. And Tesla tends to
overestimate their EPA range in ways that most others don’t. The car was rated for 240 miles of range, but there was no circumstance where I could make that happen. In contrast, my AWD EV6 went 296 miles last summer between charge stops on a road trip, which is greater than EPA range.
Your friends may be paying attention to the range estimate on their screen, which doesn’t change with conditions. It’s a flat EPA range estimate based on battery, which made me switch it off in favor of percentage. Stroll on over to a Tesla forum of your choice and you’ll see plenty of people talking about winter range loss.