The Detroit automaker's average estimated real-world fuel economy and its carbon emissions ranked the second-worst in the industry for the 2021 model-year, according to the EPA. Both automakers decreased their fuel economy and increased C02 emissions since the 2016 model-year, according to the EPA, as did Hyundai Motor , Mazda and Volkswagen . The 2021 average vehicle fuel economy was at an all-time high of 25.4 miles per gallon, unchanged from the year prior. Its average fuel economy, which is measures in terms of miles per gallon of gasoline equivalent, or mpge, was 123.9 miles. Just 4% of 2021 vehicles were electric, plug-in hybrids or fuel cell vehicles, though the EPA projects that figure will rise to 8% in 2022.

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