I just finished a drive in a Model 3 RWD from West Palm Beach, Florida to Prescott, Arizona. My recommendation is to always always always pay attention to two things if you are planning to maximize distance between charging stops (meaning get relatively close to 0%).
1. Trust the car's navigation that tells you what % you will have when you arrive at the Supercharger. It will update in "real time" (probably every couple of minutes).
2. Watch the Wh consumption in the Energy screen over both 5 miles and 30 miles to understand over time what speed you can safely travel to arrive at your destination appropriately.
We had the issue where the Deming, New Mexico Supercharger is currently closed. We charged to 100% in El Paso and Willcox, Arizona was the next charging opportunity. The car told me to charge to 100% in El Paso, but for the first 20 miles it kept telling me to turn around and charge again in El Paso because there was insufficient charge to arrive at Willcox. I watched consumption and measured my speed until the car stopped telling me to turn around, then just ensured it never dropped the estimated arrival charge level below 3% - getting it as high as 6% at one point.
The distance was 192 miles from one charger to the next, yet the car said I could drive 290 miles. I would never ever trust the "miles" of range if my drive truly depended on it.
PS. I pulled into the Supercharger showing 0% on the battery. Admittedly, once I was close enough I started speeding up (a lot) to achieve that result. Something satisfying about arriving at 0%.