A group of Model S owners in Norway said they are suing Tesla over what they claim to be discrepancy with the actual on-road performance achieved with the 'Insane Mode' over what is advertised by the company.

A group of 126 owners of the Tesla Model S P85D have said their cars reached 469 hp, which is much lower than the 700 hp as claimed by the American automaker. Kaspar N. Thommessen, an attorney at Wikborg Rein law firm representing the plaintiffs further added the low horsepower adversely affected the car's performance as well, Bloomberg reported.

Tesla responded to the accusations saying all specifications claimed by it are as per tests conducted by it, as well as the European regulatory authorities. The Model S P85D does the zero to 60 mph run in 3.3 secs, which a customer said is not accurate. However, they didn't reveal by how much their Model S cars erred by.

Tesla stated the P85D regularly did the 0 - 60 mph run in 3.1 to 3.3 secs as per tests conducted at its own facilities. The P85D model has since been replaced by the more powerful P90D in Norway where it sells for 801,000 kroner ($96,700). Interestingly, Norway has proved to be a big market for Tesla cars thanks to the tax credits doled out by the government there.

That said, this also isn't the first time where Tesla has had a brush with the law in the country. On a previous occasion, a Tesla car owner sued the company on charges that the horsepower rating of the two individual motors don't add up to what is being advertised for the car. The court had then ruled in favor of the customer. The Consumer Disputes Commission in Norway had ruled in June that the five P85D owners, who had sued Tesla over charges of inadequate acceleration, should be compensated with 50,000 kroner each.

Thommessen, meanwhile, added they would be quoting the outcome of the first court case as it prepares for a fresh legal onslaught with the American automaker, Auto Evolution reported. The first hearing to this effect is expected in mid-December.

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