I regularly make a ~300mi roundtrip with our Tesla, I wouldn't own one today if that wasn't possible.
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Before anyone brings up ChaDeMo(I have the adapter), SAE combo neither are nearly as fast(120kW) in real-world use and have nearly as much market penetration.
The super-charger network is also something that's planned and built-out with the intention of being to make the major arterials rather than having a patchwork of various companies providing chargers.