BMW
M8
Porsche
911
BMW M8 vs Porsche 911: 2025 Comparison
The short answer
The BMW M8 offers fuel economy, while the Porsche 911 excels at power instead. Choose the BMW M8 if you prioritize fuel economy in daily driving, or the Porsche 911 if power matters more for your needs. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
M8
Overall
Mixed sentiment with a clear divide between appreciation for its capabilities and criticism of its character. The vehicle is widely acknowledged as extremely fast, comfortable, luxurious, and built to a high quality with tight assembly tolerances. It is consistently described as an excellent grand tourer that does everything well, offering a blend of performance, technology, and daily usability.
Best version to buy
Insufficient owner data available to declare a consensus "best" version (e.g., Coupe vs. Gran Coupe, Competition vs. base).
Known issues
- ⚠Lack of driving emotion/excitement: described as bland, boring, or lacking visceral feel despite high performance. Frequency: very frequent.
- ⚠Ignition coil and coolant hose failures: on the hot-V 4.4L V8 in related models (M6), noted as a potential age-related concern for the M8. Frequency: isolated.
- ⚠Ride quality: described as very stiff, to the point of compromising its grand touring comfort, especially when compared to the M850i. Frequency: recurrent.
911
Overall
Sentiment is deeply polarized and varies significantly by generation and model. Long-term ownership satisfaction is frequently described as very high, with many owners reporting the car living up to or exceeding lifelong expectations. The 911 is often cited as a benchmark for driver engagement and is recognized as a highly satisfying vehicle to own.
Best version to buy
997.2 Generation: Specifically praised as the "absolute best modern 911" for combining hydraulic steering, a manual transmission, and a modern enough interior. The 997.1 Turbo is also highlighted as a desirable, proven performance variant with a durable engine and dry-sump oiling.
Known issues
- ⚠Extremely high maintenance and repair costs: Major engine or transmission failure can cost more than the car's value, and parts are exceptionally expensive. Frequency: very frequent.
- ⚠Turbo lag in modern turbocharged engines (991.2, 992): Noted as a significant dynamic flaw, with criticism that reviewers downplay its presence. Frequency: recurrent.
- ⚠Interior material quality and durability: Hard plastics, manual seats in base models, and specific issues like peeling door cards on 991 models left in the sun. Frequency: recurrent.
The verdict
The BMW M8 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Porsche 911, based on the data above. If power matters more to you than running costs, the Porsche 911 is worth a closer look instead.
Explore further
Not sure which one fits you?
Answer a few questions and get a personalized recommendation.
Frequently asked questions
Which is more reliable, the BMW M8 or the Porsche 911?
Owner reports show similar reliability sentiment for the BMW M8 and the Porsche 911. Check the known issues listed above for specific differences between the two.
Which is better for families, the BMW M8 or the Porsche 911?
Data on family-specific factors like cargo space is limited for one or both models, but based on available reports, both are positioned as practical daily drivers. Check the specs table above for seating and body type.
Which has better fuel economy, the BMW M8 or the Porsche 911?
The BMW M8 is more fuel-efficient on paper: 10.6 L/100km combined versus 11.6-11.8 L/100km for the Porsche 911, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the BMW M8 or the Porsche 911?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Porsche 911 than the BMW M8. See the known issues comparison above.