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Almost everything, including roadside assistance, is quite sparse along the 600+ mile route I intend to take through Northern Oregon and Nevada. Even while Tesla's navigation system cheerfully plans a route for me that includes Superchargers, it displays that I will reach some of those stations with only 10% battery life left. In such a remote nation, I refuse to settle for less than 20%. I would like to recalculate with a 20% safety margin; how can I achieve this in Tesla Nav?

Not possible. Increasing the intended state of charge upon arrival at the final destination is your only option. The stops for navigation superchargers are only suggestions, though. If you want to charge more at each station and have more juice when you get to the next supercharger, you can stay at each station for longer. Although there aren't always additional options, you can select to stop at different superchargers.

Planning to stay below 10% can be unsettling unless you familiarise yourself with your vehicle. Another scenario is when your path is unclear. However, I am satisfied with Tesla's suggested charging times for the most part.

As a huge chicken, I will likely charge to 80-90% at every Supercharger to maximise my energy output before leaving. From what you said, I gather that in order to save time, the Tesla-generated route plan would advise me to charge to a lower level. As long as I know I won't run out of power twenty miles beyond Dead Ox, Nevada (which is a real town, by the way), I can spend more time at the Supercharger.
A brief road trip to a city 140 miles distant was my plan on the second day of having the Tesla. Initially, I had a 90% charge, which is equivalent to around 250 miles. I had 15% remaining capacity when I reached the outskirts of my destination. I was fortunate to find a Supercharger nearby, which allowed me to fully charge my battery and continue on my journey home. The 125-mile round trip I had last week was much shorter. My vehicle's reported range decreased from 240 miles when I started it to just 85 miles when I arrived home.
Because of all I've read, I no longer have faith in Tesla's claimed range.

Making a pit stop at each SC is the worst possible move. I know how nervous you are, but hold off on the top until you reach your final goal. Simply topping off at each of the other stops will reduce the charging speed of your subsequent stop.

You shouldn't utilise what you're calling a "indicated range" because it isn't actually that. Simply tap that number to convert it to battery percentage, and then leave it that way.

You can see what your battery life should be when you get to your location thanks to the navigation system. This is an incredibly precise value. When determining that amount, Tesla considers a multitude of parameters, such as the route you're travelling, any variations in altitude, the current temperature, the weather, the use of the HVAC system, etc. Here is the value that demands your attention.


Because of this, I never ignore navigation, even when I know the route well.

For a good road trip video, I recommend Out of Spec. Watching their incredible success rate at just getting to Superchargers will make you forget about worrying about getting there with 5%-10%. They do it largely for the views.

The indicated trick—learning how to charge slightly more at a Supercharger so that you may go to the next one with a little additional charge—is one of the tricks you'll learn from those movies. To proceed, simply continue charging beyond the suggested "continue trip" amount until the navigation indicates that you will reach the next stop with 20%+ remaining.

Stopping to supercharge your battery will cause the navigation to update in real-time what your expected state of charge (SOC) will be at the next stop. Hold on until the battery life indicator reads 20%.

Just like me, you'll be attempting to reach every supercharger with zero state of charge once you get the hang of it.

Even though I don't think it will happen, I appreciate the suggestion nevertheless.

I thought you meant to say, halfway to the next supercharger with zero state of charge?

Your breakdown of rated vs. real miles driven is detailed, but you failed to mention Tesla's assessment of your battery life. Tesla does not guarantee the distance indicated by the miles next to your battery symbol. Your battery's state of charge is displayed with the EPA-rated miles equivalent. For an accurate readout of your remaining power, use the energy app located on the center screen. You will find a wealth of useful information there. The graph that I find most useful compares actual consumption on the trip to planned consumption and explains why the actual consumption is either higher or lower than anticipated.

I should mention that my brother, who has been a Tesla owner since 2013, uses the miles adjacent to the battery indicator to accurately indicate the remaining miles to empty. He consistently achieves greater range than what the EPA forecasts, surpassing their efficiency standards. It's largely his slow driving speed, but it's also partly the roads he takes (he never takes them in extremely cold weather). I believe he is a one-in-a-million, but he is proof that it is possible. The navigation system's estimations are usually right on the money, and I highly suggest the energy app to anyone else who wants specifics.