Most overrated engines

Top 40 most overrated car engines. Updated March 2025.

Horsepower sells. Car manufacturers have every incentive to advertise huge peak power numbers to make their cars more attractive. However, very few owners will ever take their car to rolling road dynamometer and actually put these manufacturer claims to the test.

This is where independent automotive press comes to the rescue of unsuspecting consumer - several well known car magazines, like Sport Auto in Germany, do regularly test new cars on rolling road dyno and, correcting for drivetrain loss, come up with "real world" engine or system power numbers.

Following list is ordered by these tested "real world" numbers divided by advertised peak power. What you get is percentage of "power loss" or degree of engine underperformance (underrating) in relation to manufacturer advertised peak power.

Some cars have been tested by multiple sources. In these cases average of all test results is used.

# make & model Percent (%)▼ Image
1. 1964 Ford Mustang High Performance -47% Photo of 1964 Ford Mustang High Performance
2. 2024 Porsche Taycan Turbo GT Weissach Package -15% Photo of 2024 Porsche Taycan Turbo GT Weissach Package
3. 2022 Caterham Seven 340R -15% Photo of 2022 Caterham Seven 340R
4. 2015 Honda Civic Type R -11% Photo of 2015 Honda Civic Type R
5. 2019 Lexus RC F Track Edition -10% Photo of 2019 Lexus RC F Track Edition
6. 2012 Subaru BRZ -10% Photo of 2012 Subaru BRZ
7. 2017 Lotus Exige Cup 380 -10% Photo of 2017 Lotus Exige Cup 380
8. 2012 Hennessey Venom GT Spyder -10% Photo of 2012 Hennessey Venom GT Spyder
9. 2014 Subaru WRX STI -9% Photo of 2014 Subaru WRX STI
10. 2013 Opel Zafira Tourer 1.6 CDTI -9% Photo of 2013 Opel Zafira Tourer 1.6 CDTI
11. 2016 Aston Martin Vantage GT8 -8% Photo of 2016 Aston Martin Vantage GT8
12. 2014 McLaren 650 S Spider -8% Photo of 2014 McLaren 650 S Spider
13. 2023 Lamborghini Revuelto -8% Photo of 2023 Lamborghini Revuelto
14. 2016 Ford Focus RS -7% Photo of 2016 Ford Focus RS
15. 2013 Aston Martin V12 Vantage S -6% Photo of 2013 Aston Martin V12 Vantage S
16. 2010 Chevrolet Camaro SS -6% Photo of 2010 Chevrolet Camaro SS
17. 2013 Audi R8 V10 5.2 FSI Plus -6% Photo of 2013 Audi R8 V10 5.2 FSI Plus
18. 2020 Audi R8 V10 RWD -6% Photo of 2020 Audi R8 V10 RWD
19. 2011 Mercedes-Benz C63 AMG Coupe Performance Package -6% Photo of 2011 Mercedes-Benz C63 AMG Coupe Performance Package
20. 2014 Citroen C5 Crosstourer HDi 165 -5% Photo of 2014 Citroen C5 Crosstourer HDi 165
21. 2016 Audi R8 V10 Plus -5% Photo of 2016 Audi R8 V10 Plus
22. 2018 Renault Megane RS -5% Photo of 2018 Renault Megane RS
23. 2025 Aston Martin Vantage -5% Photo of 2025 Aston Martin Vantage
24. 2012 Audi RS4 Avant -5% Photo of 2012 Audi RS4 Avant
25. 2014 Opel Astra 1.6 CDTi -5% Photo of 2014 Opel Astra 1.6 CDTi
26. 2014 Smart Forfour 1.0 -5% Photo of 2014 Smart Forfour 1.0
27. 2014 Renault Megane RS 275 Trophy R -4% Photo of 2014 Renault Megane RS 275 Trophy R
28. 2017 Opel Astra Sports Tourer 1.6 CDTI -4% Photo of 2017 Opel Astra Sports Tourer 1.6 CDTI
29. 2011 Aston Martin V8 Vantage S -4% Photo of 2011 Aston Martin V8 Vantage S
30. 2014 Audi TT-S Coupe -4% Photo of 2014 Audi TT-S Coupe
31. 2021 Maserati MC20 -4% Photo of 2021 Maserati MC20
32. 2017 Ford Mustang GT -4% Photo of 2017 Ford Mustang GT
33. 2014 Ford Mondeo 2.0 TDCi -4% Photo of 2014 Ford Mondeo 2.0 TDCi
34. 2013 Peugeot RCZ R -4% Photo of 2013 Peugeot RCZ R
35. 2017 Ferrari 812 Superfast -3% Photo of 2017 Ferrari 812 Superfast
36. 2008 Ariel Atom 3 -3% Photo of 2008 Ariel Atom 3
37. 2013 BMW 420d Gran Coupé -3% Photo of 2013 BMW 420d Gran Coupé
38. 2019 Ferrari F8 Tributo -3% Photo of 2019 Ferrari F8 Tributo
39. 2013 Seat Leon ST 2.0 TDI -3% Photo of 2013 Seat Leon ST 2.0 TDI
40. 2011 Mazda CX-5 2.0 AWD -3% Photo of 2011 Mazda CX-5 2.0 AWD

Sources

All data sourced from manufacturer's official figures.

List authored by Christian Zelcs. Last updated on 03/12/2025, last addition - Smart Forfour 1.0.