A 2027 Mercedes EQS Drove 539 Miles Without Charging in an Edmunds Test

A 2027 Mercedes-Benz EQS 450+ drove 539 miles without stopping to charge in Edmunds' latest EV Range Test, Electrek reported. That result beat the sedan's EPA estimate of 467 miles by 72 miles and made the EQS the longest-range electric sedan Edmunds has tested, ahead of the Lucid Air.

The only electric vehicle that has gone farther in the same Edmunds test is the Cadillac Escalade IQ, which covered 558 miles on a much larger 205 kWh battery. The new EQS uses a 122 kWh pack and an 800-volt electrical architecture, part of a broader overhaul of the electric sedan.

Range, efficiency, and charging

During the test, the 2027 EQS 450+ used 29.6 kWh per 100 miles, better than its EPA figure of 28 kWh per 100 miles as reported by Electrek, which also noted the official number and the test result. The year-old 2025 EQS 450+ had covered 464 miles and used 34 kWh per 100 miles in the same test, so the new car both went farther and used less energy.

Edmunds saw a peak charging rate of 350 kW, in line with Mercedes' estimates, and a sustained average of 222 kW. The older EQS peaked at 208 kW and averaged 175 kW. Electrek said the new EQS added 825 miles of range in an hour and 100 miles in a little more than seven minutes, nearly twice as fast as the 2025 model year.

The Edmunds EV Range Test is built to look more like everyday driving than a lab cycle. It is 60 percent city and 40 percent highway, with an average speed of 40 mph, the vehicle held within 5 mph of the posted limit, and climate control set to auto at 72 degrees.

Other results from the same test

In the same recent round of testing, Electrek said the 2027 BMW iX3 50 xDrive drove 436 miles, 44 miles above its 392-mile EPA estimate, and used 28.3 kWh per 100 miles. The 2027 Volvo EX60 covered 352 miles, and the 2027 Mercedes-Benz GLC Electric covered 392 miles.

A 539-mile run is not a promise that every EQS owner will see that number. It is one controlled test of a redesigned sedan with a bigger battery and a faster-charging 800-volt system. On Edmunds' course, that combination was enough to beat the previous long-range sedan benchmark and to close much of the gap with a far heavier, larger-battery SUV.