BMW 8 Series M850i xDrive vs Porsche Panamera Base — 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.BMW 8 Series M850i xDrive: $152,319 net over 10 years ($6,056/yr running). Porsche Panamera Base: $141,842 net over 10 years ($5,894/yr running). Estimates for Cedar Park, TX; every assumption is editable.