Plug-in hybrids emit almost as much pollution as gas cars, report finds

The difference in emissions between plug-in hybrid electric vehicles (PHEVs) and gas cars is merely 19 percent and not 75 percent as lab tests show, according to a report by a group of European transport and environment NGOs. They analyzed data transmitted by the onboard fuel consumption meters of 800,000 plug-in hybrids registered in the continent between 2021 and 2023. What they found was that the real-world carbon dioxide emissions of PHEVs were 4.9 times higher than what they're supposed to emit on paper, mostly because of manufacturers' and testers' flawed assumption on the share of the vehicles' electric driving mode. 

Specifically, the official estimates for the share of electric driving mode are 84 percent, but the share is only as little as 27 percent i...