Tesla's Roadster update will allow it to travel 400 miles on a charge

Most companies would avoid announcing good news on a day when no one is paying attention, Tesla CEO Elon Musk does things a bit differently. Musk just teased some news on Twitter about the company's Roadster line, saying a forthcoming upgrade would endow the car with a nearly 400-mile range -- enough to drive from LA to San Francisco without having to stop for a recharge

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