Thousands of models are 30% worse on average when measuring miles per gallon in real-world conditions, according to comprehensive new data
Just two cars deliver their advertised fuel economy when on the road, with the thousands of other models 30% worse on average in the real world, according to comprehensive new data.
Some cars, such as the Fiat 500 and Ford Fiesta, gave barely half the mileage advertised.
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Source: Guardian Environment