The gap has widened between the fuel efficiency that carmakers declare for their models and the reality for drivers, with luxury German vehicles showing the biggest divergence, a study found."Real-world" carbon emissions for new cars based on fuel consumption are about 25 percent higher on average than carmakers say, compared with 10 percent a decade ago, according to research by the non-profit International Council on Clean Transportation (ICCT).
The findings will add to pressure for the reform of EU vehicle testing procedures to ensure that advertised fuel efficiency values better reflect normal use. That in turn could make it harder for manufacturers to meet a new EU carbon dioxide (CO2) vehicle emissions target proposed for 2020.
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