def carbon_to_miles(kg_carbon):
    """
    8.89 × 10-3 metric tons CO2/gallon gasoline ×
    1/22.0 miles per gallon car/truck average ×
    1 CO2, CH4, and N2O/0.988 CO2 = 4.09 x 10-4 metric tons CO2E/mile

    Source: EPA
    """
    return 4.09 * 10 ** -7 * kg_carbon
