In all reallity 250-300 miles would be all that is needed if you take the model of drive for 4 hours then take an hour break to eat/relax while the car charges. That would also allow the charging current to be drastically reduced to the 10's of kw.
55mph*4hours =220miles (plus much less energy required)
75mph*4hours = 300miles (1.45 hours further traveled vs 55)
Many people may be willing to make that much of a sacrifice provided having charging stations at where they are going to stop.
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