What is the average capacity of a car's fuel tank?

The average capacity of a car's fuel tank typically ranges from about 12 to 15 gallons (45 to 57 liters). Smaller cars may have tanks closer to the lower end of this range, while larger vehicles, such as SUVs and trucks, can have tanks that exceed 20 gallons (76 liters) or more. However, this can vary widely depending on the make and model of the vehicle.