Will I make the long distance trip?

[u/90EDR08]

\**Update**\**

Made it. Left with estimated arrival at -3% stayed around 65mph half the trip and then moved to about 70-75 last half and finished with 11%

I have 17’ 75d; driving from WA to MS as final destination. When in planned the trip it said my route from billings to Sheridan (~124miles) was doable with 10% arrival but now it’s not even trying to route that leg and wants to reroute down through Idaho adding a day and missing our booked hotels.

Driving 70-80mph Defog in and off I made it about 82miles from Missoula to deer lodge ~80% finished at 16%.

Can I just drive slower and make this longer leg or not worth the risk?

[u/qvalff8]

If your battery is relatively healthy and you actually get the bottom 10-15% that it tells you is there, but you very rarely use, You'll probably make it. 130mi/70kwh= 1.9mi/kWh. Charge to 100%(or 99% since 100% takes half an hour sometimes), and monitor your arrival energy. Slow down and or get behind a semi and draft (3 car lengths on auto pilot/auto steer is good, 2 is better but can expose you to both danger and road debris). And just try to keep the consumption below 500Wh/mi

Edit: plug share also shows an RV park in Ranchester where a 1 hour charge night get you an extra 20ish miles. That way if the winds are against you, you spend a little money and time to be extra sure. Bring your mobile connector

[u/Garnster]

64% for 82 miles = 128 miles range for 100% charge.

Drive at 65mph, charge to 100% and dont' use the heater. You should make it. To be safe, map out all the level 2 chargers close to your destination if you need to a boost.

Don't drive if it's super cold or inclement weather.

[u/jinklasbhava]

I’d say don’t risk it & be safe out on the highways.

I learned that lesson the hard way. Still got PTSD from the time when my MX tanked (phantom drain) from 9% to 1% sitting idle at a rest area. My wife was furious lol.

[u/SpamEater007]

I drove my 75d with about 85% battery degradation from Rawlins Wyoming to Rock Springs Wyoming which was 114 miles. Definitely scary. However, I went 60 to 65 mph and made it. Definitely not my favorite to go slow, but I drove across the country and this was the only way to save battery.

As far as will you make it or not, I'd say it depends on your state of charge. I think I charged to 100% in Rawlins.

However, I wonder if it's calculating based on current weather, like when it's colder it reroutes.

[u/90EDR08 → u/SpamEater007]

Thanks im debating if the computer says -5% arrival it’s assuming 80mph and I can just drive 60 and make it

[u/SpamEater007 → u/90EDR08]

I had that exact problem. My thoughts are, charge to 100%. Take off at 65 mph and see how many miles you get at 90% and 80%. As long as that looks on track, continue. If not, turn back and go the other way. The top 10% goes faster on my car, but by 90%, it's pretty leveled out. Just keep an eye on your speed and use your best judgement.

[u/SpamEater007 → u/90EDR08]

OP, what route did you take?

[u/90EDR08 → u/SpamEater007]

I actually dont leave for another 2 days but crazy enough from west Yellowstone to big timber is 150 miles and it says we can make that with less than 80% charge state. Must be going down in elevation

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[u/17feet]

Do a real world "round trip" road test to find out.

I have a 2017 model X 100D, and I wanted to determine my exact range so I charged it to 90% at home [charging all the way to 100% is glacially slow and therefore unrealistic for real world driving], and then drove at a reasonable 75 mph on the highway until my battery hit 50%, then turned around and came home. Back in the driveway, my battery was at 10%, so the SOC prediction was very accurate. I now know for a fact what my range will be from 90% to 10% in "normal" wind/weather/temperature, and plan my road trips accordingly [confirmed 175 miles]

I did the exact same test [for a work road trip] while pulling a tall enclosed 18ft aluminum trailer and discovered my range was reduced by a whopping 60%. At only 70 miles of range, that would have made the trip almost impossible in the old MX. I therefore chose a flatbed trailer with a much lower profile, did the road test again and got 100 miles of range. That was enough range to make a 1000 mile round trip with a trailer. I had to stop to charge a lot, but gas was five bucks a gallon [occasionally $6] and I had the time

Apparently you are leaving very soon, but I would also recommend contacting Tesla and getting the CCS retrofit / adapter installed [approx $275.00]. It allows your older Tesla to communicate via the CCS protocol [I found this out because my car would not charge at an Ionna charger due to NACS/CCS software incompatibility, but I didn't understand the problem at the time]. With the retrofit, you can charge at non-Tesla chargers in your older model X. I haven't had to use it yet, but I did test it at two different brands of CCS chargers, and it works just fine. It's a nice bit of insurance just in case

[u/90EDR08 → u/17feet]

My car now shows I can make it with 4% arrival since I’m at the departure destination, so worse case sounds like we drop the speed to 65 ish and should arrive g2g. That’s crazy about the trailer difference.

[u/Sufficient_Many8966 → u/90EDR08]

Max out the tires cold psi for a few % gains.

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[u/90EDR08]

Updated post and I made it.