The Mercedes-Benz Vision EQXX.Mercedes-Benz Mercedes-Benz's electric concept car drove 747 miles on a single charge of its battery pack. The longest-range electric car on the market is the 520-mile Lucid Air, which costs $169,000. The Vision EQXX isn't for sale. Mercedes-Benz's ultra-long-range electric car traveled 747 miles without stopping to charge, beating its previous record, the company said Thursday.