Survey of 1 million vehicles in Europe reveals that real consumption differs greatly from official laboratory tests; Premium brands lead detours
A new survey based on real traffic data has called into question the efficiency of plug-in hybrid vehicles (PHEVs). Conducted by the Fraunhofer Institute in Europe, the study revealed that the fuel consumption of these cars on the streets is up to three times higher than that recorded in official homologation tests.
The analysis compiled information from approximately 1 million cars manufactured between 2021 and 2023. The figures were extracted directly from the European on-board consumption monitoring system (OBFCM). Unlike controlled laboratory tests, which are often criticized for not reflecting reality, these data illustrate the behavior of vehicles in the daily use of drivers.
SEE ALSO:
While official efficiency certificates often point to unrealistic consumption between 50 km/l and 100 km/l, the actual average observed on European streets jumped to around 16.6 km/l. According to the researchers, the distortion occurs because laboratory tests are based on the optimistic premise that the user recharges the battery at the outlet frequently and runs almost exclusively in electric mode. In practice, whether due to negligence in recharging or on longer trips, the combustion engine ends up being the main propeller, drastically increasing expenditure and emissions.
The abyss between theory and practice affects automakers unevenly. Models from premium brands, especially Porsche, recorded the largest consumption deviations. On the other hand, manufacturers such as Kia, Toyota, Ford and Renault presented results closer to the homologated figures, although with reservations. Questioned, Porsche said that its vehicles strictly comply with current regulations and that actual consumption varies according to driving style and traffic conditions.
Plug-in hybrids have played a crucial role in the industry achieving strict European CO2 reduction targets. However, if this systematic discrepancy is made official by the authorities, the bloc could revise its testing criteria and cut tax incentives.
