If you are stuck in traffic, the Tesla uses much less power than at high speeds—due to the slow speeds reducing wind and rolling friction.
Traffic jams generally INCREASE range for Teslas, with the best results when you are moving along pretty steadily at speeds around 20–40MPH.
- Cold temps suck up some power, but what REALLY sucks it up is when you are in a downpour of heavy wet snow and ice. Still, I think the car loses maybe 35% total range in the worst conditions. So that is about 100 miles out of my 310 normal range. Typical winter use of the heater and other accessories uses more like 20%. A/C on the hottest days—more like 10–15% (In Denver, with Window Tint. Phoenix or Vegas would be more).
EXAMPLE
I have been stuck in stop and go traffic more times than I can count on my 40 mile trip to work.
When the traffic is good, I typically leave my home with 234 miles of range (75% charge) and arrive with 194—exactly 40 miles of range used. This is averaging about 55-65MPH. When I get back home, the car is at 154 miles of range—and it takes 1 hour and 50 minutes to charge back up.
When the traffic is bad, and it is stop and go most of the way, I can average as little as 20 MPH—which makes my 40 mile trip take 2 hours. In this case—my mileage goes UP…WAY UP. I put the Tesla on Autopilot and a lot of the time it is stopped, waiting for the car in front of me to move, and it is using pretty much nothing when stopped. When the car is traveling at 20 or 40MPH—it is using very little juice. So, I can arrive at work with it appearing that I have traveled only 20 miles of the actual 40 mile distance. This gives me back 50% of my range, and if I am using heater and accessories, maybe I am typically using 20% range for that. So slowing down usually more than makes up for the heater.