What sort of overnight loss of range are you seeing in your Model 3?
The weather is getting cooler here in Southern Ontario and last night was around the freezing mark.
That is more than you should lose overnight, but more details may shed some light:
-do you park outside or in a garage?
-do you have climate controls on?
-do you pre heat before leaving in the morning?
-do you use any apps like teslafi to log the car activity?
-do you regularly check the car status during the evening?
Each of the above things could cause the car to not go to sleep/use excess energy.
I still am surprised the model 3 has such high parasitic loss as my volt and bolt never lose range over multiple days of being parked. But yes, Tesla's do lose range like this.
When in sleep mode I estimated the power draw to be around 70W, so overnight (say 12 hours) you should lose around 0.8 kwh of energy, or around 4-5 km of rated range.
When in standby (before sleep mode), it will draw about 250W, or about 3 kwh of energy, which is close to 20km of range....so sounds like your model 3 isn't going to sleep for some reason, or you have the climate control on all night.
Noticed that i lost about 18km of range overnight.
Is this in line with what you are seeing with similar temperatures?