U.S. Department of Energy guidelines state that it takes between 3,000 to 5,000 miles of driving to break in a new engine and reach the optimal fuel economy.
Car Manufacturing Impacts Mileage
The slightest variation in assembling a new car can impact the estimated fuel mileage and a few drivers will notice a marked deviation from EPA estimates.
Changing New Car Fuel Lables
The U.S. Environmental Protection Agency (EPA) and the Department of Transportation are proposing different fuel economy labels for new cars. One suggested label uses a letter grade with an A+ going to electric vehicles. The other suggested label uses horizontal bars to compare mileage to other cars, the environmental impact of carbon emissions and a slider bar to depict cost of fuel rather than fuel savings.
Maintance Retains Fuel Estimates
The EPA determines fuel economy using cars with 5,000 miles to allow for the break-in period. The EPA says fuel economy typically improves in the first few years of ownership and will retain it's optimum gas mileage if properly maintained.
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