Porsche Cayenne vs BMW iX
The BMW iX is the more efficient of the two: it reaches 97 mpg combined versus 24 mpg for the Porsche Cayenne, a 73 mpg advantage and costs about $2,500 less per year to fuel.
Across 4 measured categories, the BMW iX leads in 4. Figures are EPA test data, not manufacturer claims.
2015–2026
Porsche Cayenne
Standard Sport Utility Vehicle 4WD · 97 configurations
2022–2026
BMW iX
Standard Sport Utility Vehicle 4WD · 35 configurations
Head-to-head specifications
| Metric | Porsche Cayenne | BMW iX |
|---|---|---|
| Best combined MPG | 24 mpg | 97 mpg ✓ |
| Best city MPG | 21 mpg | 99 mpg ✓ |
| Best highway MPG | 29 mpg | 94 mpg ✓ |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $3,300 | $800 ✓ |
| Lowest CO2 output | 174 g/mi | Not available |
| Engines offered | SIDI, SIDI; PHEV, 4.0, 3.0 | Not available |
| Transmissions | Automatic (S8), Automatic (AM8) | Automatic (A1) |
| Drivetrains | All-Wheel Drive | All-Wheel Drive |
| Fuel types | Premium, Premium and Electricity, Premium Gas or Electricity | Electricity |
| EPA class | Standard Sport Utility Vehicle 4WD | Standard Sport Utility Vehicle 4WD |
| Years covered | 2015–2026 | 2022–2026 |
| Configurations on record | 97 | 35 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
Cayenne vs iX: common questions
Which is better on gas, the Porsche Cayenne or the BMW iX?
The BMW iX is the more efficient of the two: it reaches 97 mpg combined versus 24 mpg for the Porsche Cayenne, a 73 mpg advantage and costs about $2,500 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW iX runs about $800 a year in fuel at its most efficient configuration, versus about $3,300 for the Porsche Cayenne — a difference of roughly $2,500 per year.
What engines do the Cayenne and iX offer?
Porsche Cayenne: SIDI, SIDI; PHEV, 4.0, 3.0. BMW iX: no engine data on record.
Are they in the same vehicle class?
Yes — the EPA classifies both the Porsche Cayenne and the BMW iX as Standard Sport Utility Vehicle 4WD, so they compete directly.
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Comparison id: porsche-cayenne-vs-bmw-ix