BMW X5 vs Porsche Cayenne
The BMW X5 is the more efficient of the two: it reaches 27 mpg combined versus 24 mpg for the Porsche Cayenne, a 3 mpg advantage and costs about $400 less per year to fuel.
Across 5 measured categories, the BMW X5 leads in 5. Figures are EPA test data, not manufacturer claims.
2015–2027
BMW X5
Standard Sport Utility Vehicle 4WD · 61 configurations
2015–2026
Porsche Cayenne
Standard Sport Utility Vehicle 4WD · 97 configurations
Head-to-head specifications
| Metric | BMW X5 | Porsche Cayenne |
|---|---|---|
| Best combined MPG | 27 mpg ✓ | 24 mpg |
| Best city MPG | 24 mpg ✓ | 21 mpg |
| Best highway MPG | 31 mpg ✓ | 29 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,900 ✓ | $3,300 |
| Lowest CO2 output | 130 g/mi ✓ | 174 g/mi |
| Engines offered | SIDI & PFI; Mild Hybrid, SIDI; PHEV, SIDI; Mild Hybrid, 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 and Electricity, Diesel | 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 | 61 | 97 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
X5 vs Cayenne: common questions
Which is better on gas, the BMW X5 or the Porsche Cayenne?
The BMW X5 is the more efficient of the two: it reaches 27 mpg combined versus 24 mpg for the Porsche Cayenne, a 3 mpg advantage and costs about $400 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW X5 runs about $2,900 a year in fuel at its most efficient configuration, versus about $3,300 for the Porsche Cayenne — a difference of roughly $400 per year.
What engines do the X5 and Cayenne offer?
BMW X5: SIDI & PFI; Mild Hybrid, SIDI; PHEV, SIDI; Mild Hybrid, SIDI. Porsche Cayenne: SIDI, SIDI; PHEV, 4.0, 3.0.
Are they in the same vehicle class?
Yes — the EPA classifies both the BMW X5 and the Porsche Cayenne as Standard Sport Utility Vehicle 4WD, so they compete directly.
More X5 comparisons
Comparison id: bmw-x5-vs-porsche-cayenne