In a study by the AAA of how closely drivers' real world fuel economy matches vehicle EPA estimates...
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Owners with cars equipped with manual transmissions enjoyed 17-percent higher real-world results.
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AAA culled its data from an analysis of 37,000 records submitted to the EPA, and those records contained more than 8,400 vehicle make, model, and model-year combinations.
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In the real world, fuel economy diverges widely from EPA estimates