Each carmaker faces its own CO2 target, based on the weight of its vehicles. A business selling smaller cars such as Peugeot owner PSA therefore has a lower CO2 target than a company with a heavier average vehicle, such as Mercedes owner Daimler. Photograph: Keystone via AP

When Blas Arambilet tried to buy an electric car in April, something strange happened. Months after ordering a white Kia e-Niro from his local Barcelo(...)