When's the last time you got the advertised MPG in a gas car? The EPA range test for an EV uses the same test cycles as a gas car -- and those never match your reality.
The only other comment on range estimates is that the route planner in the car does a pretty good job of estimating use for each drive -- and has 2 very useful features: A) gives a round-trip estimate at the bottom (you have to look for it a bit though), and B) it will route you to superchargers if you can't make it to your destination...
Hertz tends to have the smaller battery Teslas, so they have a ~265ish EPA range at 100% charge (and the new battery chemistry in these allows 100% charge all the time...). If you were in stop-and-go freeway traffic and local roads the majority of the time, you'll likely see 240ish real-world range. If you have open roads and drive 70-75 most of the time, expect 200ish...
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