Mercedes G-Class (2016) is 266 mm (10.47 inch) longer, 80 mm (3.15 inch) wider, 515 mm (20.28 inch) higher and has 187 liters (6.60 ft3) bigger cargo space than Opel Ampera (2014).
Opel Ampera (2014) is 938 kg (2,068 lbs) lighter than Mercedes G-Class (2016).