The document compares the fuel efficiency of different types of vehicles, including gasoline and diesel models. It discusses that diesel vehicles tend to have higher fuel efficiency than gasoline vehicles, getting around 15-20% more kilometers per liter. However, diesel fuel has a lower energy density than gasoline, measured in megajoules per kilogram. The document also notes some advantages of electric vehicles, such as having no direct emissions and lower fueling costs compared to gasoline or diesel cars.