Chevrolet Volt (2020) is 120 mm (4.72 inch) longer, 145 mm (5.71 inch) higher and has 138 liters (4.87 ft3) bigger cargo space than Porsche Cayman (2014).
Porsche Cayman (2014) is 12 mm (0.47 inch) wider and 316 kg (697 lbs) lighter than Chevrolet Volt (2020).