Last week, the new base version of the Tesla Model S, known as the 70D, hit the electric-car world like a thunderclap. No early-warning publicity, no teasing tweet from Elon. Just the sudden appearance on the Tesla website configurator of the new model--with dual motors, all-wheel drive, a 70-kWh battery that gives it an EPA range of 240 miles, and a base price of $75,000.



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