The real challenge for Tesla is going to come when more experienced car manufacturers start cranking out their own electric cars. One particularly fearsome competitor in this regard is Porsche, which earlier this fall-unveiled its new Mission E concept, a new four-door, four-seat all-electric car that features system power of 600 horsepower, acceleration of 0 to 60 miles per hour in under 3.5 seconds, a driving range of more than 310 miles per charge, and a recharge time of just 15 minutes. Now-Bloomberg informs us that Porsche has committed to building the Mission E and having it in showrooms at the end of the decade. DON’T MISS:-Google’s picks for 2015’s best Android apps “With Mission E, we are making a

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