The vehicle with the longest range was specifically purchased because home charging doesn’t work for us. We live in house downtown in the largest city in Canada. The appeal of the Tesla was the range such that we didn’t need to worry about at home charging solutions. A bi-weekly trip to a supercharger would be more than plenty even in the winter. It appears this isn’t a battery issue, but rather a misrepresentation of what we were purchasing when we discussed our needs with the salesperson. We said we drive 5-10 kms a day each way to work. With a range of almost 600kms we were told this vehicle would have no problem doing that. I think any reasonable person would agree there is a problem here. Shockingly, the vehicle is now expensive to operate than a gasoline vehicle.
This happens all the time in the model 3 forums. Someone looks at the car, thinks "the model 3 long range has a range of 310 / 350 miles, I only drive 20 miles a day, I dont have supercharging at home but this is no issue as I can just supercharge every 10 days or so and it will be fine.
It absolutely positively 1000000% does not work that way, ever. In addition, the model X is heavier than a model 3, and has a much higher wh/mi than a model 3. Also, the OP is pre conditioning the battery "to improve range" when the car is not plugged in, which just uses electricity to heat the battery without moving the car. Preconditioning does improve range, but cost energy.
The advice to do that is not for someone who is not charging from the wall.
Additionally, people look at the range when buying and forget that they will not be using all of it. OP (with no home charging) is only charging to 80% for some reason (probably to "save the battery"), when at a minimum they should be charging to 90% since they have no home charging. A brand new model X is rated for 371 miles. Thats 100% to 0 %. No one is doing that (often) anyway, What the REAL range is is 80% (what this OP is charging to) to about 20-30% (what a person would re charge at).
Thats 296 miles to 111 miles, or 185 miles. 185 ish miles is the effective range of charging to 80% and discharging to 30%, or 297 km. The car will not roll off miles "1:1" (just like an ICE). Unlike an ICE, this effect is magnified in the cold. 185 miles range (charging from 80% to 30%) driven at one time will likely be 140-150 miles.
Driven over several days, will likely be more like 100 miles, and that doesnt count any pre conditioning, pre heating, sentry mode etc. Sentry mode on a model 3 uses 1-2 miles an hour. No idea what it uses on a model X but I suspect its similar.
The OP can make this a "bit" better but it will never be "oh we can just charge at the supercharger every 2 weeks or so", not now, and not in the summer either. Ways to make it "better"
1. Stop charging to "80%". Charge to 90% since you dont have home charging, and are concerned about attempting to stretch the time between charging.
2. Stop pre conditioning the car if its not plugged in, you are simply wasting range that way It only helps range if its pre conditioning from a plugged in situation, because otherwise you are burning more energy than you would be saving by pre conditoning.
3. Dont use sentry mode, unless you completely necessary (uses 1-2 miles an hour of range)
4. Dont check on the car using the app when its sleeping
5. dont use any third party apps at all (teslafi, stats, teslamate, any watch app etc etc), or if you do, triple check that they are configured properly to let the car sleep. Basically, any app that can interact with the car also can wake the car, and when the car is not sleeping it uses miles at a higher rate (why sentry mode uses 1-2 miles an hour, the car doesnt sleep)
5. if you have FSD turn off standby summon. This uses additional range as well
These will help, but the car will never be one you can drive 10 miles a day for 2 weeks and supercharge, with no charging in between. If thats the expectation, then you should likely sell the car to cut your losses and move back to an ICE vehicle.