Why plug-in hybrids consume (much) more fuel than expected
A recent study published by the European Commission reports that plug-in hybrid cars are actually considerably more polluting than carmakers claim. On average, they produce around 3.5 times the emissions that they theoretically should, with drivers using more fuel than initially estimated.
Hybrid vehicles are reported to be much more polluting than expected.
(Copyright: deepblue4you / Getty Images)
As of January 1, 2021, all new cars sold in Europe must carry an onboard fuel consumption monitor, a small device that measures the amount of fuel used, whether you drive a gasoline, diesel or hybrid vehicle. This monitoring has enabled the European Commission to producea report about actual CO2emissions compared to the theoretical data provided by manufacturers. Unfortunately, the situation is far less flattering than carmakers might hope.
The study shows that, for plug-in hybrids, CO2 emissions are 3.5 times higher than advertised. The “real” average fuel consumption for this type of vehicle is 5.94 l/100 km, compared with 1.69 l/100 km according to manufacturers’ figures. This means that, in reality, plug-in hybrids emit an average of 139.4g of CO2 every kilometer, compared with the 39.6g claimed by manufacturers.
To explain this difference, the report points out that drivers don’t typically use these hybrids in electric mode as often as they could, whereas in testing, the automakers use them in an optimized way. Owners of these vehicles make much more medium- to long-distance journeys on secondary or trunk roads, where the combustion engine is put to work, rather than at low speeds in town, where the electric motor takes over.
It should be noted that the European Commission has modified the calculation of the utility factor, which corresponds to the proportion of kilometers covered with the electric motor compared to those covered with the internal combustion engine, in order to bring it closer to real-life conditions. These changes will apply from 2025.
This report is based on data collected throughout 2021, on a sample of 617,194 cars, including 123,740 hybrids.
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