On average, it takes approximately 2 to 5 minutes to fill up a car's gas tank at a typical gas station in the United States. This duration can vary depending on several factors, including the size of the gas tank, the speed of the fueling nozzle, and the efficiency of the pump. For instance, a small car with a 10-gallon tank might take around 3 minutes to fill, while a larger vehicle with a 20-gallon tank could take closer to 5 minutes. Additionally, the speed of the nozzle can be influenced by the type of fuel being pumped, with some stations offering premium fuels that may take longer to dispense.

The time it takes to fill up with gasoline is influenced by the flow rate of the fuel, which is determined by the pump's design and the pressure of the fuel supply. According to the U.S. Energy Information Administration, the average fueling rate for gasoline is about 5 gallons per minute. This means that a 10-gallon tank would take about 2 minutes to fill, assuming the pump operates at its maximum flow rate. However, it's important to note that the actual time can be longer due to factors such as the pump's ability to maintain pressure and the driver's habits, such as stopping to check the fuel level or paying for the fuel.

Data from the National Highway Traffic Safety Administration (NHTSA) also suggests that the average fueling time can be affected by the type of vehicle. Larger vehicles, such as SUVs and trucks, often have larger gas tanks and may take longer to fill compared to smaller cars. Furthermore, the efficiency of the pump itself can vary, with some models being faster than others.

In conclusion, the time it takes to fill up with gasoline in the United States typically ranges from 2 to 5 minutes, with factors such as tank size, pump efficiency, and vehicle type influencing the duration.