Fuel efficiency of Nissan Sentra: Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The website provides a list of Nissan Sentra models along with their fuel efficiency ratings. Which of the following options correctly describes the fuel efficiency of Nissan Sentra?
1) The fuel efficiency of Nissan Sentra is not available on Fueleconomy.gov.
2) The fuel efficiency of Nissan Sentra is measured in miles per gallon (MPG).
3) The fuel efficiency of Nissan Sentra is measured in kilometers per liter (km/L).
4) The fuel efficiency of Nissan Sentra is measured in liters per 100 kilometers (L/100 km).