On-road tests find plug-in hybrids from BMW, Peugeot and Renault emit more CO2 than advertised.

Although plug-in hybrid cars are still presented as a climate solution, tests on the newest generation of PHEVs indicate they pollute significantly more than claimed on city and commuter routes.

Two years ago, Transport & Environment (T&E) found the technology, which contains an electric battery and a combustion engine, polluted significantly more than advertised on longer routes, and three recent PHEV models, a BMW 3 Series, Peugeot 308 and Renault Megane, emitted more CO2 than advertised when tested on the road even when starting with a full battery. The BMW polluted three times its official rating when driven on a typical commuter route, according to the tests by Graz University of Technology, commissioned by T&E. The Peugeot 308 and Renault Megane plug-in hybrids performed better but still polluted 20 per cent and 70 per cent more than claimed, respectively, despite the relatively short round-trip distance covered (34 miles).

In city driving, the Peugeot had just over half (53%) of the advertised electric range on a single charge while the BMW had only 74%. Only the Renault had the electric range claimed.

Richard Hebditch, director of Transport & Environment UK, said: “Plug-in hybrids are sold to drivers and governments as part of the climate solution. The truth is they pollute far more than advertised and are a dangerous distraction from full electrification. In city and commuter tests, they pollute significantly more than advertised. The Government’s plans to decarbonise driving must be based on the reality of their emissions, not on the industry’s claims.”

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