Overall thermal efficiency can depend on the fuel used; diesel and gasoline engines can reach up to 210 g/kWh and about 40% efficiency. Natural gas can yield an overall efficiency of about 200 g/kWh. Average fuel consumption values are 160–180 g/kWh for slower two-stroke diesel cargo ship engines using fuel oil, reaching up to 55% efficiency at 300 rpm; 195–210 g/kWh for turbodiesel passenger cars; 195–225 g/kWh for trucks; and 250–350 g/kWh for naturally aspirated Otto cycle gasoline passenger cars.