The Mercedes-Benz C-Class running cost picture depends most on fuel or charging use, tyres, insurance and the chosen variant price. The available running-cost clue is 2025 C 200 Avantgarde Line: 7 L/100km; 2025 C 200 AMG Line: 6.2 L/100km. Lower energy use helps in daily commuting, while a sensible purchase price keeps insurance and financing easier to manage over the ownership period.