package cse1030;

/**
 * A simple utility class for converting US fuel economy values to metric fuel
 * consumption values.
 * 
 * @author CSE1030Z
 * 
 */
public class FuelEfficiency {
  /**
   * The number of litres in one US gallon.
   */
  public static final double LITRES_PER_GALLON = 3.785411784;

  /**
   * Converts US fuel economy (in miles per US gallon) to metric fuel
   * consumption (in litres per 100 km).
   * 
   * @param mpg
   *          The fuel economy in miles per US gallon.
   * @return The fuel consumption in litres per 100 km.
   */
  public static double toLitresPerHundredkm(double mpg) {
    double kmPerGallon = DistanceUtility.milesToKilometres(mpg);
    double gallonsPerHundredkm = 100.0 / kmPerGallon;
    return gallonsPerHundredkm * LITRES_PER_GALLON;
  }

  private FuelEfficiency() {
    // private to prevent instantiation
  }


}