The vision eqxx completed a long-range test of over 1,000 km. It was among the longest distances covered by an electric vehicle on a single charge.

Temperatures ranged from 3 to 18 degrees Celsius (37 to 64 degrees Fahrenheit). The vehicle traveled at an average speed of 54 mph.

The vision eqxx’s state of charge on arrival was around 15 percent, leaving the vehicle with a remaining range of 87 miles. That is more than twice the typical range that most EVs on the road today can travel.

Mercedes first introduced the vision eqxx earlier this year as primarily an experiment in battery efficiency. With its sporty intentions and sleek, futuristic design, the concept car will likely serve as the basis for a production car.

The vision eqxx will consume energy at a rate of 10kWh per 100 kilometers, or more than 6 miles per kWh. Those tests were based on a simulation of real-world traffic conditions.

Mercedes said the vision eqxx’s superior range was’completely realistic’. The results from the real-world tests will serve to bolster those claims.

Even the EPA’s rating system is only meant to present a snapshot under the specific conditions of the agency’s testing process. It typically excludes factors such as steep hill climbing and the effects of cold weather, which can wear down a vehicle’s battery much faster than when driving on flat surfaces or in warmer weather.