3405 miles / 5478 km in 24 hours

In June 2025, Mercedes-AMG unveiled a 1000 kW concept car called AMG GT XX. The big news was that the GT XX can be charged at 850 kW. This means that megawatt chargers – that were originally developed for trucks – will be made available for passenger cars.

The AMG GT XX has new type electric motors – axial flux motors. Compared to radial flux motor, the axial flux motor is many times lighter and smaller, yet much more powerful! The axial flux motor is Mercedes’ secret weapon.

The axial flux motors were developed by British company YASA. Mercedes-Benz acquired YASA in 2021 and AMG elevated the motors to a new level. The YASA AMG motor is less than 4″ / 10 cm wide, yet it delivers around 350 kW of power. The AMG GT XX has three such motors, one at the front and two at the back.

Properly camouflaged prototype in Tallinn on June 28, 2025

The battery in the GT XX is capable of accepting more than 850 kW of power at 1000 amperes. The battery cells are cooled with oil.

850 kW charging power sounds extraordinary, but how to demonstrate it? Mercedes decided to organize a long distance test where they wanted to cover 40,000 km in less than 8 days. This means that the GT XX had to cover at least 5000 km in 24 hours.

For the test, the Porsche-owned Nardò Ring in Italy was chosen. Nardò Ring is literally a ring, with the length of 12.68 km. Two cars were used for the test.

The lanes of Nardò Ring are banked at such a degree that the driver doesn’t need to turn the steering wheel when driving in the speed range indicated on the track.

Although the GT XX is capable of more than 360 km/h (224 mph), according to the analyses 300 km/h (186 mph) was the optimal speed to cover the longest distance.

Alpitronic 1000 kW charger is the first to transfer megawatt of power via CCS cable.

At 300 km/h (186 mph), around 83% of the energy is required to overcome drag. This is why the GT XX was made very aerodynamic. Its drag coefficient is just 0.198.

In 24 hours the GT XX managed to cover 3405 miles / 5478 km. This means that the average speed was 141 mph / 228 km/h despite the charging stops! This is a big record.

17 racing drivers drove two cars for 8 days.

George Russell, Mercedes-AMG F1 driver. It looks that the car is charging at 945 kW.

On August 25, 2025, the mission was accomplished. The test was completed after 25,000 miles / 40,225 km. It took 7 days, 14 hours, 9 minutes and 52 seconds. The average speed was 137 mph / 220 km/h.

It wasn’t just one GT XX that mastered this extremely long test, but two. After a week and 3177 laps the cars crossed the finish line just 2 laps apart.

The chequered flag is in the hands of Ralf Aron.

This extremely long test showed how amazing an electric Mercedes-AMG is.