Don't disagree but why is 180 the magic number?
Supercharging is available for Model S with 60kWh pack or larger. Will be available for Model X which comes with 60kWh pack as smallest pack right from the beginning. We don't know the EPA ratings for Model S with 60kWh pack, but a good guess should be 88% of 230 miles = 200 miles. Model X will have a small penalty for increased vehicle weight and aerodynamic drag, something like 10% were mentioned. So that would be 180 miles for a range charged Model X-60 that's driven down to zero SoC.
The Supercharging network is designed to give the best road trip experience possible to the top-level Tesla cars. That means charging with full power in the least possible time, then hit the road again and drive to the next supercharger. Charging is at 90kW for the 85kWh packs, going from near zero SoC to about 50% SoC. 50% of maximum range is restored. That would be 130 miles for Model S and 120 miles for Model X. That gives the optimal distance between supercharger stations.
Folks with smaller packs presumably have to charge slower (e.g. at 60kW for the 60kWh pack) and longer (up to 75% SoC). Less convenient, but still very feasible.
So any superchargeable GenIII vehicle will have a battery pack that can be replenished with 130 miles of EPA-rated driving range within 60 minutes, and the top-level models within 30 minutes. Tesla can engineer towards this target with better vehicle efficiency, increased pack capacity, and/or increased charge rates.
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