The type of fuel you put in a car depends on the vehicle’s engine. Most cars on the road today use either gasoline or diesel fuel. Gasoline is the most common and comes in several octane levels to suit different engines. Diesel, on the other hand, is often found in larger vehicles like trucks. Increasingly there are more fuel options, from electric cars, which you plug in, to cars that run on alternative fuels like propane gas or biofuel made from various types of biomass. Always remember to check your vehicle’s manual or the fuel door for the manufacturer’s recommended fuel type to keep your car running smoothly.