The latest data suggest that PHEV technology in some newer models still pollutes significantly more than official tests suggest. The campaign group Transport & Environment (T&E) commissioned the Graz researchers after similar analysis in 2020 found much higher emissions than advertised from PHEVs, particularly as some users do not charge them. Burning more fuel adds to running costs and increases polluting carbon emissions. Tests by independent groups, including UK consumer group Which?, have repeatedly found that PHEVs burn more fuel than the laboratory figures suggest. Peugeot’s 308 polluted 20% more than its official rating of 27g, while Renault’s Megane was 70% above the official test of 30g. The research found that BMW’s 3 Series emitted 112g of carbon dioxide per kilometre, three times its official rating of 36g. However, campaigners argue that the cars are more polluting than claimed.
Carmakers say they can offer the best of both worlds by allowing owners to drive long distances while retaining the ability to drive with zero emissions. Plug-in hybrid electric vehicles (PHEVs) combine a small battery with a traditional petrol or diesel engine.
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