German car rental company Sixt has announced plans to buy as many as 250,000 vehicles from carmaker Stellantis over the next three years for the company’s rental fleets in Europe and North America. “The agreement covers a total value of several billion euros,” Sixt announced on Tuesday. “The first deliveries on a significant scale” are to take place by the end of March, the company said. Konstantin Sixt, the company’s co-chief executive, said the agreement with Stellantis would enable the company to accelerate its growth strategy. The Stellantis Group includes Citroën, Peugeot, Fiat, Maserati,…