From Motor Trend and the Tesla Model S
According to the EPA's 5-cycle test procedure, it's rated at 265 miles in its extended range mode, which fills the battery nearly to its brim. But after our testing wrapped, and we plugged it in to recharge, I happened to glance at the car's big, 17-inch, multi-touch display and its energy-use data. Eeek -- all of our testing, including a few dragstrip runs just for photography, had consumed 13 miles. And the car's computer was predicting that at the abusive rate we were going, our Model S was only good for another...40 miles. A 265-mile range? Is this really possible?
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Tesla Model S Review - Motor Trend