I don't think that's right. Admittedly, I'm making a guesstimate just like you, but I don't think you can linear-ize that battery graphic. Although I've seen electrek do the same thing, they are always in Tesla cheerleader mode so I try to account for the extra does of optimism they have!
Here's how I'd calculate it: if the car has 95 miles of current charge and the rate of charge is 169 miles per hour and there is 50 minutes left to a "full charge" (to the 90% mark), then the car will receive 152 miles to reach 90%. That disregards the graphic and just takes the estimate the Tesla battery management system is using. I realize that isn't perfect either, but I think it's a better way to look at it.
So that means the 90% mark is roughly 247 miles. And by extension, the 100% mark is roughly 270 miles (an additional 10%).
I think a range that high has to be the larger battery (else it will cannibalize Model S sales too much), so I'm guessing the larger batter 100% range is 270 miles and the standard battery 100% range is 230-240 miles (roughly equivalent to a Chevy Bolt).
