Plug in Hybrid Vehicles Emit Almost as Heavily as Gasoline Vehicles, Report Finds

Plug-in hybrid cars produce nearly five times more global warming emissions than official figures show, as per a recent report.

Widening Discrepancy In Lab and Real-World Emissions

Statistics reveals that PHEVs emit only one-fifth lower CO₂ than traditional petrol and diesel cars, based on research conducted by a advocacy organization. That contrasts sharply with lab tests, which suggested a 75% decrease in pollution.

Researchers studied data from onboard energy use monitors of eight hundred thousand vehicles registered in the EU between 2021 and 2023. The team found that actual CO₂ emissions from PHEVs in 2023 were nearly five times greater than lab estimates, increased from 3.5 times in 2021.

“Actual CO2 output are increasing, while lab-reported figures are falling,” stated a lead researcher participating in the study. “That discrepancy is growing and creates a significant problem. As a result, PHEVs pollute almost as much as petrol cars.”

Key Reasons Driving the Discrepancy

Researchers attributed the majority of the gap to inflated estimates of the “electric driving share” – the ratio of kilometers driven in battery power compared to overall distance. The team found that only 27% of driving was completed in electric mode, whereas lab assumptions suggested 84%.

Even, when running in EV mode, emission levels were well above lab projections. That occurred because electric motors were insufficiently powerful sufficient to function independently, resulting to engines using gasoline for nearly a third of the travel completed in electric mode.

Regulatory and Financial Consequences

Based on estimates, the lowballing of PHEV CO2 output allowed several major automaker companies to avoid more than €5bn in penalties between 2021 and 2023, by falsely easing adherence with EU fleet-average CO₂ standards.

Furthermore, owners of PHEVs would pay approximately €500 extra per year in running costs than is assumed under lab tests.

“The bold claims that manufacturers like to make about their plug-in hybrid vehicles are clearly way off the truth,” commented a automotive analyst. “Buyers are being misled into believing that by buying a PHEV, they are benefiting the environment and saving money. In reality, PHEVs are little better than standard petrol and diesel cars in terms of energy consumption, CO₂ emissions, and operating costs.”

Policy Discussion and Industry Pressure

Plug-in hybrid vehicles have lately been brought back into political discussions as automakers have lobbied the European Union to relax CO₂ targets. A planned prohibition on sales of new internal combustion cars in 2035 has faced heavy lobbying from the automotive sector and resistance from EU countries with significant automotive industries.

Several senior officials have proposed PHEVs as a potential “compromise” solution to include in the regulation.

One external energy policy expert, who was unaffiliated with the study, called the analysis a “highly valuable contribution” after years in which segments of the automotive sector argued there was insufficient data to properly evaluate actual CO2 output.

“The results demonstrate, beyond any doubt, that the difference between lab and actual PHEV fuel consumption and CO₂ output is much, much larger than for petrol or diesel vehicles,” the expert said. “All regulatory changes regarding PHEVs should be implemented with utmost caution and in the light of this evidence.”