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Can a car travel for 7 hours on 21 gallons of fuel?

The answer depends on the fuel efficiency of the car. Most cars average around 20-30 miles per gallon (MPG). So if a car gets 20 MPG, it can travel 7 hours at an average speed of 60 MPH if it has at least 21 gallons of fuel. However, if the car only gets 15 MPG, it will need more than 21 gallons to travel for 7 hours at 60 MPH.

Additionally, the fuel consumption of a car may vary based on the following factors:

1. Vehicle type: Different types of vehicles have different fuel efficiencies. For example, smaller, more aerodynamic cars typically consume less fuel than larger, heavier vehicles.

2. Engine Size: Generally, vehicles with larger engines consume more fuel than those with smaller engines.

3. Driving Conditions: Fuel consumption is affected by factors such as traffic congestion, stop-and-go driving, and the use of air conditioning or heating systems.

4. Tire Pressure: Maintaining proper tire pressure can improve fuel efficiency.

5. Speed: Driving at higher speeds can reduce fuel efficiency.