My gut reaction as a Tesla driver for nearly 6 years is that you're cutting it to close with your trip. Can you give some more details? It sounds like you might be travelling in one or more areas where superchargers are sparse or missing entirely.
abetterrouteplanner.com says you'll be cuttin' it close (on my computer): 63 MPH max speed, start with 100% battery and arrive with 12%. That's with 18" wheels and aero covers. If you have 19" wheels, I wouldn't try it. You may be missing salient details of your route like elevation changes or prevailing winds.
That’s not really how it worked. In the document Tesla provided to the EPA, it indicated ~80 kWh total and ~78 kWh usable. Many have been seeing between 72-75 kWh usable however.
If I was in your shoes, I'd make the slight detour to the Catoosa supercharger -- 193 miles from Russellville -- as my first leg. Unless the weather was perfect, I was alone, and I felt like an adventure (which might end with driving 30mph for 20+ miles
).
If you have the aero wheels you should be good. I have been very close to rated miles on the interstate at 70 mph. Headwinds, hard rain and elevation can also work in your favor or against you.
The navigation in the car does take elevation into account, but not HVAC or driving style. I've done several day trips through the mountains in Colorado and I usually arrive 5%ish less battery than it said when I started. But I crank the AC and usually cruise 10-15 over the speed limit.
Forgot to mention that the variance is similar whether I'm going uphill or downhill.
