The range estimate is based on your recent trips. There are 4 key factors other than how you drive:
1. Temperature - batteries are less efficient at lower temps.
2. Use of heat & ac, especially heat.
3. Terrain - going up hills takes more power than you can gain (regen) going down the other side of the hill
4. Regen - driving in L mode will maximize putting power back into the battery when you have to slow down or are going downhill.
So, my personal recommendations are:
- Use heat very sparingly, rely more on seat and steering wheel heaters.
- Always drive in L mode and try not to use the brakes at all (its a fun game).