Real-world data shows plug-in hybrids use far more fuel than advertised

WTF?! The promise of plug-in hybrid electric vehicles (PHEVs) was simple: lower emissions and drastically reduced fuel consumption. However, real-world driving data tells a different story. In the most comprehensive analysis yet of vehicle behavior outside testing labs, Germany's Fraunhofer Institute found that PHEVs consume fuel at rates far higher than their manufacturers claim.

Using data transmitted wirelessly from roughly one million PHEVs produced between 2021 and 2023, the researchers measured actual fuel consumption across diverse driving conditions and found an average of six liters per 100 kilometers – roughly three times the officially certified figures.

The findings highlight a growing gap between laboratory tests and on-road performance in hybrid technology. PHEVs rely on two propulsion systems: a traditional internal combustion engine and an electric motor powered by an externally charged battery.

This dual-mode setup allows drivers to toggle between electric and fuel power, depending on speed, distance, or battery ...