@interface NSUnitFuelEfficiency : NSDimension <NSSecureCoding> @property (class, nonatomic, readonly) BOOL supportsRegionalPreference; @property (class, readonly, copy) NSUnitFuelEfficiency *litersPer100Kilometers; @property (class, readonly, copy) NSUnitFuelEfficiency *milesPerImperialGallon; @property (class, readonly, copy) NSUnitFuelEfficiency *milesPerGallon; @property (class, readonly) BOOL supportsSecureCoding; + (void)initialize; + (id)icuType; + (id)baseUnit; @end