Porsche 718 Cayman GT4 RS vs Porsche 911 Carrera — Cost of OwnershipCompare any two cars on the true 5–10 year cost of ownership: purchase price, fuel or electricity, insurance, maintenance, registration, depreciation and resale value. EV vs gas, lease vs buy, with every assumption editable.Porsche 718 Cayman GT4 RS: $202,375 net over 10 years ($7,856/yr running). Porsche 911 Carrera: $158,211 net over 10 years ($6,704/yr running). Estimates for Cedar Park, TX; every assumption is editable.