Tesla is being sued by a group of Norwegian Tesla Model S owners who claim the performance of their P85D performance edition Model S sedans is not as quick as Tesla’s “Insane Mode” marketing would suggest.

Kaspar N. Thommessen, an attorney representing the plaintiffs at Wikborg Rein law firm, said the car “has too low horsepower,” adding, “it affects the car’s performance, according to the consumers.”

The Oslo District Court has set a mid-December date for hearings from some 126 plaintiffs, according to a recent report by Bloomberg.

Norway’s Consumer Disputes Commission ruled in June that five Tesla Model S owners should be reimbursed up to 50,000 kroner ($10,000 CAD) each, after complaining of inadequate acceleration from their P85D-model cars.

The Tesla Model S P85D is capable of accelerating from standstill to 100 km/h in 3.1 seconds; it has recently been succeeded by the P100D, which packs a 100-kWh battery and is capable of hitting 100 km/h in as little as 2.7 seconds.

The Tesla Model S P100D retails for $165,200 at Canadian dealerships.