Mercedes C-Class (Coupe) (2014) is 94 mm (3.70 inch) longer, 52 kg (115 lbs) lighter and has 31 liters (1.09 ft3) bigger cargo space than Opel Ampera (2017).
Opel Ampera (2017) is 17 mm (0.67 inch) wider and 9 mm (0.35 inch) higher than Mercedes C-Class (Coupe) (2014).