There’s been some concerns over the way Tesla is reporting the power output of its Model S, especially the Dual Motor version. Until recently, the company advertised the combined power output of both motors without accurately accounting for the limitations of the battery pack.

This resulted in the Model S rarely, if ever achieving the advertised horsepower. After several complaints from owners, CTO JB Straubel wrote a blog post explaining the logic behind Tesla’s calculations, but some owners in Norway still moved forward with formal complaints to the local consumer protection agency. Norway’s Consumer Council is now acting as a mediator between Tesla and over 150 Model S owners or about 25% of the ~600 Dual Motor Model S owners in the country. Ingeborg Flønes, director of consumer services at the Consumer Council, told a Norwegian newspaper:

“There have been a steady stream of complaints and they continue to come. Right now, Consumer Council works as a neutral mediator between the parties. We try to find a solution. This process is not public.”

The company also issued a statement:

Our customers have expressed doubts about how many horsepower the Model S delivers on wheels.To create clarity, we have changed the way we communicate horsepower on our website.

Earlier this month, Tesla changed the advertised horsepower of the Model S P85D from 691 hp to 463 hp.

The company also offers the ‘Ludicrous upgrade’ to increase the max power output of the battery pack from 1300 to 1500 Amps, which enables 532 hp according to Tesla. – still significantly less than the original 691 hp.

Features image: Tesla Model S, photographed by James Lipman