Tesla owners in Norway -- the EV maker's second-largest market -- filed a complaint over the power output of the Model S P85D, and it looks like they may be in line for a $6,000 payday.

The problem stems from Tesla marketing the car as producing 691 hp (467 hp from the rear motor and 224 hp from the front). In dynamometer testing it doesn’t quite match that number, because Tesla came up with their horsepower figure by just adding the output of the front and rear together. Tesla has since changed the way they market their power, reducing the quoted number from 691 hp in the P85D, to 532 hp in the P90D with Ludicrous mode.

However, over 150 P85D owners felt cheated by this horsepower deception and took it up with Norway’s Consumer Council. The council sided with Tesla here, but when the same group took the problem to the Consumer Disputes Commission, they decided in favor of Model S owners. This penalty won’t be cheap for Tesla, since the Model S is actually the best-selling car in Norway. Tax deductions and various other benefits you receive for driving an electric make a Model S half the price of a BMW 7-Series or Porsche Panamera. Tesla could end up being on the hook for well over a million dollars if all the Model S P85D owners collect their payments.

The fight doesn’t appear to be over yet, though: Tesla is still reviewing the decision, and an appeal might be forthcoming.

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