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2026 Porsche 911 Turbo S Cabriolet vs 2027 BMW M4 Competition M xDrive Convertible

EPA figure2026 Porsche 911 Turbo S Cabriolet2027 BMW M4 Competition M xDrive Convertible
Model year20262027
Body · driveMinicompact · All-Wheel Drive · GasSubcompact · All-Wheel Drive · Gas
Combined MPG1818
City / highway MPG15 / 2216 / 22
Fuel a year$4,550$4,550
Tailpipe CO₂ (g/mi)504479
Engine3.6 L 6-cyl turbo3.0 L 6-cyl turbo
TransmissionAutomatic (AM-S8)Automatic (S8)

▲ marks the better official figure on that line: more range, MPG or MPGe; less fuel cost or CO₂. From fueleconomy.gov.