Efficiency on my return journey was better than on outward journey. I do not recall any significant changes on both trips (apart from the car was an extra passenger heavier on a way back). Could charging at slow speed at home result in a low battery trip life compared to charging at Supercharger? If relevant, my lifetime data: 3,888 miles; 1,542 kWh; 397 Wh/mi
397Wh/mi lifetime average is really high. I'm curious what was your trip consumption average. Did you happen to reset a trip meter prior to the drive? IIRC, my Wh/mi consumption was "only" ~320 with 4 people, full trunk, HVAC on, and cruising at ~75MPH on a long distance trip.
The 80/90 is massively less efficient than 70mph. There’s your answer! At least you know it’s not the car playing up.Thank you Everyone for kind contribution! I have learnt that:
1) yes my consumption was higher than usual but not shocking to most of you (so it is a relief for me!);
2) many factors I have not considered especially the speed (on my way back after the second charge I felt a bit more "adventurous" and at some point I did get a warning message to keep speed under 85 if I still wish to reach my destination w/o re-charge); I really did not think that the 70 to 80 mph difference is so noticeable for battery consumption (as you know it is certainly not noticeable when motorway driving);
3) thank you GriLLA for TeslaFi and manual calculation example!
There’s a square relationship between speed and air resistance, but that’s only one part of the energy usage picture. There’s no doubt that energy usage goes up significantly with speed but in reality I don’t think the mileage impact is even inversely proportional never mind squared.There's a square relationship between speed and energy so @70mph = 4900units @90mph = 8100units or 65% more.
You got to love these environmentally friendly cars that encourage folk to burn through the watts..