Citroen plans to be the first automaker in Europe to offer a “pay-per-use” leasing scheme with the launch of the new C4 Cactus. The scheme mirrors plans offered by mobile phone operators.”The pay-per-use scheme will include a monthly lease rate plus an additional payment that will vary according to the kilometers driven in the month,” Citroen CEO Frederic Banzet said during a preview of the car last month. He declined to provide specific details, which will be revealed at the Geneva auto show on Tuesday.