How Many Miles Does a Gallon of Gas Last: List Of Fuel-Efficient Cars

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Imagine going on a road trip with your car’s gas tank filled, but suddenly your car starts indicating a low gas level in the middle of the road. Now what? You can easily escape from such situations by tracking your car’s gas usage and researching how many miles a full gas tank lasts. So, how long does a full tank of gas last?

It depends on certain factors, but a good rule is that a full tank will last about 300 miles. However, your mileage may be lower if you’re driving in traffic. Also, highway driving will get you 400 miles or more.

average miles per tank of gas

In short, there’s no definitive answer; you can make an estimate based on average driving habits and fuel economy ratings. So, how far can you go? Read on to find out!

What Influences How Many Miles Can a Full Tank of Gas Go?

Several factors influence how many miles a full tank of gas can go; let’s discussed the most common factors:


The traffic on the roads can significantly impact how many miles a full gas tank can last. If there is a lot of stop-and-go traffic, the engine will use up more fuel, and the mileage will suffer.


The quality of the oil in the engine can also affect mileage. If the oil is dirty or low-quality, it will cause the engine to work harder and use up more fuel.

Road Conditions

The condition of the roads can also play a role in how many gallons per mile a car gets. If the roads are smooth and well-maintained, the vehicle will provide more mileage in less fuel. However, if the roads are rough or full of potholes, the car will use more fuel to overcome these obstacles.

Size of Gas Tank

The gas tank size can also affect how far a car can go on a full tank. If the gas tank is larger, the gas tank capacity will be higher.

For example, a car with a 45-liter tank will use more fuel than a 65-liter tank. The larger tank can hold more fuel, so the vehicle can cover more distance before refilling.

Fuel Injectors And Air Filters

The fuel injectors and air filters supply the engine with fuel and air. If these components are dirty or not functioning correctly, they can cause the engine to use more fuel than it otherwise would.


Both cold and hot weather can affect mileage. In cold weather, the engine has to work harder to maintain its operating temperature, which can use up more fuel. The air is less dense in hot weather, so the engine doesn’t have to work as hard to draw in air. As a result, the car will use less fuel.

Tire Conditions

The inflated and properly treaded tires require low rolling resistance to keep a tire rolling at a certain speed, consuming less car fuel. However, if the tires are underinflated or have bald tread, they will have higher rolling resistance, and the car will use more fuel.

How to Calculate Gas Mileage

If you want to know how much gas your car uses, you can calculate it yourself using the odometer and a few simple math steps. Here’s how:

Get the Miles Traveled From the Odometer

The odometer in your vehicle tracks the total miles your car has traveled. If you want to know how many miles you’ve driven in a certain period, you can reset the odometer at the beginning and then recheck it at the end. It will give you an accurate reading of the miles you’ve driven.

Divide the Miles Traveled by the Number of Gallons It Took to Refill the Tank

Once you know how many miles you’ve driven, divide that number by the number of gallons it took to refill your gas tank. For example, if it took 10 gallons of gas to refill your tank at the gas station and your odometer showed that you’d driven 400 miles, you need to divide 400 by 10.

The Result Will Be Your Car’s Average Miles Per Gallon

The resulting number will be your car’s average miles per gallon. And that’s all there is to it; by doing this, you can easily calculate your car’s gas mileage.

However, your car’s gas mileage may vary depending on several factors, such as driving conditions, weather, and vehicle type. But with a bit of practice, you should get a pretty accurate idea of how much gas your car is using.

Which Cars Can You Drive the Furthest on One Tank of Petrol?

The most efficient and least fuel-efficient cars result in the longest and shortest distances, respectively, to get on one tank of petrol.

Most Efficient

When it comes to fuel efficiency, some cars are better than others.  If you’re looking to get the most out of your petrol, you’ll want to choose a car that gets great mileage.  Here are a few of the most fuel-efficient cars on the market:

  • Toyota Prius: This hybrid car is one of the most efficient on the market, getting up to 51 mpg in the city and 48 mpg on the highway.
  • Honda Civic Hybrid: Another great hybrid option, the Civic Hybrid gets up to 44 mpg in the city and 47 mpg on the highway.
  • Toyota Camry Hybrid: The Camry Hybrid is a reliable and fuel-efficient option, getting up to 43 mpg in the city and 39 mpg on the highway.
Car ModelGas MileageTank CapacityCost To Fill TankCost Per Mile
Toyota Prius51 miles per gallon11.9 gallons, up to 607 miles$40$0.08
Honda Civic Hybrid44 miles per gallon12 gallons, up to 528 miles$35$0.07
Toyota Camry Hybrid43 miles per gallon17 gallons, up to 731 miles$40$0.055

Least Efficient

The least fuel-efficient cars on the market tend to be large; the shortest distance you can expect to get on one petrol tank is probably around 350 miles. Here are some models that are least fuel efficient cars on the market. If you’re looking to save money at the pump, you’ll want to avoid these models.

  • Chevy Sonic: The Chevy Sonic gets an estimated 26 mpg in the city and 34 mpg on the highway.
  • Ford Focus: The Ford Focus is slightly better, with an estimated 27 mpg in the city and 35 mpg on the highway.
  • VW Jetta: At last, the VW Jetta takes the cake, with a measly 25 mpg in the city and 34 mpg on the highway.
Car ModelGas MileageTank CapacityCost To Fill TankCost Per Mile
Chevy Sonic26 miles per gallon13 gallons, up to 338 miles$40$1.47
Ford Focus27.2 miles per gallon14 gallons, up to 380 miles$45$1.17
VW Jetta25.5 miles per gallon15 gallons, up to 383 miles$50$1.96
average miles per tank of gas

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How far can an average car travel?

That depends on many factors, including the make and model of the car, how well it is maintained, the driver’s habits, and local road and weather conditions. An average car can travel between 200 and 400 miles on a full gas tank.

How Do You Tell If Your Gas Tank Is Full?

There are a few ways to know when your car’s tank is full:
– One way is to look at the gas gauge. Most cars have a gas gauge that will tell you how much fuel is in the tank. If the needle is on the right, then the tank is full.
– Another way is to listen to the car. The car will make a “glugging” sound when the tank is full. 
– Look at the fuel level indicator on the pump. Most pumps have a fuel level indicator that will tell you when the pump has shut off automatically.

Do Cars Perform Better When They Have a Full Tank?

It’s a common misconception that a car’s engine runs more efficiently when the tank is full. In reality, it makes very little difference whether the tank is half-full or full. It still has a slight impact when the car starts, and the engine is cold.

A full gas tank will help the engine run smoothly with less effort. However, once the engine is warmed up, the difference is negligible.

How Does a V8 Engine Save Gas?

V8s tend to have more torque than smaller engines. So, they can speed up quickly without revving the engine too high, which can help save fuel. Not only this, V8s often have cylinder deactivation technology; when you do not need full power, you can shut off some of the cylinders.

How Do I Estimate Gas for a Trip?

There are a few different ways to calculate gas for a road trip. You can use your car’s gas mileage and estimate the number of miles you’ll be driving or use a gas calculator.

Final Considerations

Now that you know how many miles a full tank of gas will last, it’s time to hit the road and see for yourself! Remember to keep the average mpg figure in mind to get the most out of every gallon. 

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Matt's interest for vehicles began at an early age, inspiring his lifelong excitement for all things automotive. He embraces the virtual world to indulge in his automobile interest as an avid Gran Turismo player. His writing ability effortlessly brings to life intriguing stories and educational articles on everything car-related.

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