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The charging does add half an hour to a three-and-a-half hour trip, about 15%This is true. I was considering round trip. The information is from the Wiki:
400 miles @ 65mph ~ 6.5 hours in an ICE, if you have to gas up along the way.
400 miles @ 54mph ~ 7.5 hours + 2.5 hours of charging.
That's quite a difference; one is a day trip, the other is an long day. And it's worse in the winter. Canada is a big place. I regularly drive, 4,5,6 hours without stopping. I have a hard time understanding how people think stopping for an hour every 3 hours of your trip is reasonable. To me, the answer would be to not use the Model S in such a situation, which is fine. But when I have to say, "That trip is too far for my car", and said car approaches 6 figures, it means it's niche, IMHO.