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