Here are my recommended settings to maximize range while driving:
1. Keep your aero caps on and make sure they're firmly attached. These can increase your range by about 5%. Make sure your tires are properly inflated to 41 PSI while cold.
2. Set regeneration to Standard instead of low. It will take a while to get used to it, but learning to drive with regen is part of the joy of an EV.
3. Set your driving mode to hold. This strengthens regen more, and lets you try driving with just the accelerator pedal (one pedal driving). The less you can touch the brakes, the more energy you'll save.
4. Chill mode. I know most people hate this, but it's still pretty peppy in chill mode. Nothing kills range more than unnecessary sprints.
5. Set your Autopilot speed to "relative" and set it for 5 MPH over the speed limit. Second to acceleration, range drops off with speed. Use autopilot at a set speed to minimize unnecessary fluctuations in speed and maximize regen on downward slopes.
6. If necessary, turn off the heat and use the seat heater. My tests have shown this can save about 60 wh/mi.
In terms of minimizing phantom drain between drives:
1. Turn off sentry mode if you're parked in a safe-enough part of town. Sentry mode keeps your vehicle awake which drains the battery while you're parked.
2. Don't use third party apps like TeslaFi. Same reasons as above. Every time they query the vehicle for data it wakes it up.
3. Don't constantly check your Tesla App, as this also wakes the vehicle.
The Model 3 SR+ is the most efficient EV in the entire world, and has a bigger battery than 90% of non-Tesla vehicles. If you follow my advice, you should achieve the rated range easily.