Your plug-in hybrid might be guzzling way more fuel than you think!
It turns out that those eco-friendly plug-in hybrid electric vehicles (PHEVs) are using significantly more fuel on the road than their manufacturers are letting on. A massive analysis, looking at data from nearly a million PHEVs, has revealed a surprising truth about their real-world fuel consumption.
The Fraunhofer Institute, a leading research organization, conducted what's believed to be the most extensive study of its kind. They tapped into the data wirelessly transmitted by PHEVs from various carmakers while the cars were actually being driven. The vehicles in this study were all manufactured between 2021 and 2023. This incredible dataset allowed researchers to pinpoint the exact fuel usage in everyday driving conditions, which is a stark contrast to the official figures you see in the EU's certification.
What exactly are PHEVs? They're a clever blend of a traditional petrol or diesel engine and an electric motor powered by a rechargeable battery. This setup offers drivers the best of both worlds: the option to use cleaner electric power when available and the convenience of a combustion engine for longer journeys or when the battery is depleted. Manufacturers often highlight their impressive fuel efficiency, boasting figures as low as one to two litres per 100km on paper. However, environmental advocates have long harbored doubts about these claims.
But here's where it gets controversial... This new study found that PHEVs consume, on average, six litres per 100km. That's a staggering 300% more fuel than what's officially stated! The scientists at the Fraunhofer Institute pinpointed the main culprit: the frequent switching between the electric motor and the combustion engine. It was widely claimed that PHEVs used little to no fuel when running on electric power. However, this study's findings suggest that the combustion engine is activated far more often than manufacturers have led us to believe.
Patrick Plötz from the Fraunhofer Institute shared with German broadcaster SWR that they suspect the combustion engine in PHEVs kicks in much more frequently than anticipated. Alarmingly, German-manufactured PHEVs were among those with the highest average fuel consumption, with a high-end Porsche model performing the worst.
Plötz is urging regulators to pay attention to this real-world emissions data. He suggests that manufacturers who don't meet emission limits on the road should face penalties. For instance, Porsche hybrids were found to consume around seven litres per 100km when the electric motor is engaged, significantly more than other PHEVs and even conventional non-PHEV cars in combustion engine mode. On the other end of the spectrum, Kia, Toyota, Ford, and Renault vehicles showed the lowest fuel consumption, often using less than one litre per 100km, meaning they were up to 85% more fuel-efficient than the Porsche.
And this is the part most people miss... When asked about these discrepancies, Porsche attributed them to "differing usage patterns" that influence fuel consumption. They maintain that their measurements align with legal requirements, stating that their figures are based on "legally prescribed EU measurement procedures" which ensure "uniform and comparable values across Europe." Porsche also noted that "deviations from individual real-world consumption figures can arise due to different usage profiles and external conditions," such as road conditions or driver behaviour.
The scientists are now calling for EU regulators to update their measurement methods to reflect these real-world findings and to implement stricter controls on how PHEV fuel consumption is assessed. They also emphasize that the CO2 limits for a manufacturer's fleet need urgent adjustment.
The EU Commission, responsible for CO2 limits, declined to comment on the study's findings when contacted by SWR. Meanwhile, the German Association of the Automotive Industry remains confident that the current methods for determining fuel consumption and CO2 emissions are reliable.
What do you think? Are the official fuel consumption figures for PHEVs misleading? Should manufacturers be held more accountable for real-world emissions? Let us know your thoughts in the comments below – we'd love to hear your agreement or disagreement!
