Porsche Cayenne vs BMW X6
The Porsche Cayenne and BMW X6 are evenly matched on fuel economy — both peak at 24 mpg combined — so the decision comes down to engine choice, drivetrain, and class.
Across 4 measured categories, the Porsche Cayenne leads in 2. Figures are EPA test data, not manufacturer claims.
2015–2026
Porsche Cayenne
Standard Sport Utility Vehicle 4WD · 97 configurations
2015–2027
BMW X6
Standard Sport Utility Vehicle 4WD · 47 configurations
Head-to-head specifications
| Metric | Porsche Cayenne | BMW X6 |
|---|---|---|
| Best combined MPG | 24 mpg | 24 mpg |
| Best city MPG | 21 mpg | 23 mpg ✓ |
| Best highway MPG | 29 mpg ✓ | 27 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $3,300 | $3,150 ✓ |
| Lowest CO2 output | 174 g/mi ✓ | 359 g/mi |
| Engines offered | SIDI, SIDI; PHEV, 4.0, 3.0 | SIDI; Mild Hybrid, SIDI & PFI; Mild Hybrid, SIDI, SIDI; |
| Transmissions | Automatic (S8), Automatic (AM8) | Automatic (S8) |
| Drivetrains | All-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Premium, Premium and Electricity, Premium Gas or Electricity | Premium |
| EPA class | Standard Sport Utility Vehicle 4WD | Standard Sport Utility Vehicle 4WD |
| Years covered | 2015–2026 | 2015–2027 |
| Configurations on record | 97 | 47 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
Cayenne vs X6: common questions
Which is better on gas, the Porsche Cayenne or the BMW X6?
The Porsche Cayenne and BMW X6 are evenly matched on fuel economy — both peak at 24 mpg combined — so the decision comes down to engine choice, drivetrain, and class.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW X6 runs about $3,150 a year in fuel at its most efficient configuration, versus about $3,300 for the Porsche Cayenne — a difference of roughly $150 per year.
What engines do the Cayenne and X6 offer?
Porsche Cayenne: SIDI, SIDI; PHEV, 4.0, 3.0. BMW X6: SIDI; Mild Hybrid, SIDI & PFI; Mild Hybrid, SIDI, SIDI;.
Are they in the same vehicle class?
Yes — the EPA classifies both the Porsche Cayenne and the BMW X6 as Standard Sport Utility Vehicle 4WD, so they compete directly.
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Comparison id: porsche-cayenne-vs-bmw-x6