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I heard the miles per charge is nothing but government lies and nowhere near the real numbers

That’s the EPA talking; I for one have never seen anything better than the “city” mileage the EPA estimates. Real “best case” stuff seems to come out of the EPA . . .
There is no gainsaying the fact that the aerodynamic drag of any vehicle goes up as the square of the speed - and that it’s far from rare for people on expressways to (dare I say it) treat the posted speed “limit" as a suggestion.
Pursuant to its “full self driving” software project, Tesla installs cameras in all its cars, and accumulates data on actual driving behavior on a massive scale compared to any other organization . . . and Tesla asserts that the rate of vehicles actually coming to a complete stop at stop signs is like 0.1%.
The included computer in a Tesla actively plans how you can recharge your vehicle so you should never run out of juice. But reportedly the computer’s estimate of remaining range available starts out optimistic if the vehicle is fully charged - and gets realistic as the battery charge declines. The computer knows where every available charging stall is, and can anticipate if a given charging station will have an available stall when you arrive there. There are a lot of Tesla - made charging stations - especially in “blue” states and Florida, but nationwide.
Plus, of course, it is normal for people to buy a charger for their Tesla so they can plug in when their cars are in their garages. That works far better using a 220V outlet than a 110v one, of course. Juice is likely some cheaper that way than on the road, but either way electricity cost per mile driven is substantially better than gasoline cost per mile driven.