7.3 Powerstroke Fuel Mileage: A Complete Breakdown

The fuel mileage of your 7.3 Powerstroke engine depends on the tank capacity, driving habits, engine maintenance, and road conditions.

In general, 7.3 Powerstroke fuel mileage is 10-12 miles per gallon on city roads and 12-14 miles per gallon on highways, when the engine is new. As it ages, the mileage may drop to 8-9 miles per gallon.

Several factors go into determining Powerstroke 7.3 MPG, and we will discuss them in detail. You will also learn how to improve fuel mileage.

Let’s see how you can calculate the mileage accurately and maintain the mileage for longer for the legendary 7.3 Powerstroke.

7.3 Powerstroke Mileage: Quick Chart

This chart shows 7.3 Powerstroke mileage in different conditions. Check it out.

Tank CapacityMPG in CityMPG on HighwayMaximum Range
34 gallons10-12 miles per gallon12-14 miles per gallon340-470 miles
48 gallons10-12 miles per gallon12-14 miles per gallon480-670 miles

What Is the Fuel Mileage of a 7.3L Power Stroke Engine?

We took help from Fuelly to obtain real mileage data from 7.3 Powerstroke owners. This engine was mostly used in Ford Super Duty trucks.

We have the data of Ford F-250 and F-350 Super Duty trucks, where the 7.3 Powerstroke engines ran for 5.4 million miles. So, what is the fuel mileage of 7.3 Powerstroke engine?

According to the data, the 7.3 Powerstroke mileage on-

  • 2003 models was an average of 12.2 MPG.
  • For 2002, the mileage was 13.6 MPG.
  • Previous models up to 1999 had an average mileage of 13.9 MPG.

Considering the 2003 and 2002 models of the engine used in F-350 trucks, the average mileage was-

  • 12.6 MPG. Though it was slightly less for 2001 models at 11.2 MPG.
  • 2000 and 1999 models had an average mileage of 13.5 MPG.

Remember, these are based on real owners driving in different conditions. So, you should check the factors that affect fuel mileage 7.3 Powerstroke.

What Affects the 7.3 Powerstroke Fuel Mileage?

Driving habits, vehicle load, tire pressure, road conditions, and other factors can affect the fuel mileage of your 7.3 Powerstroke engine. Here’s a quick overview of the reasoning.

● Driving Habits:

How you drive determines how many miles you can go with a full fuel tank. If you accelerate or brake rapidly, that affects the engine’s mileage. It mostly happens in city driving conditions where you must slam the brake now and then.

● Vehicle Load:

This engine is used in heavy-duty trucks, meaning they need to haul a lot of weight. The mileage can go down if you push the engine to its limit. If you can tow, that can take some extra toll on mileage.

● Tire Pressure:

Maintaining the ideal tire pressure is crucial to having maximum mileage out of the 7.3 Powerstroke engine. If the tires are underinflated, they can reduce the mileage.

● Engine Maintenance:

Various engine components, such as fuel or air filters, get dirty over time. The quality of the fuel or air can make these components go bad quickly. If you don’t maintain these components, it will affect the fuel mileage.

Other problems with the engine can also affect the mileage. You can learn more about 7.3 Powerstroke problems.

How to Test the 7.3 Powerstroke Engine Fuel Mileage?

Though modern vehicles come with a fuel mileage gauge, you need to manually check the mileage on the 7.3 Powerstroke engine to get the accurate value.

Here is how to do it:

  • Fill up the tank of your vehicle
  • Reset the trip computer
  • Drive the vehicle normally until the fuel tank is empty
  • Fill the tank again
  • Now, check the reading on the trip meter. And check how many gallons of fuel you need to fill the tank the second time
  • Divide the mileage by the number of gallons
  • You got 7.3 Powerstroke mileage

Tips to Improve 7.3 Powerstroke Mileage

If you experience a lower mileage than usual on the 7.3 Powerstroke, you can take the following actions to improve it.

  • Clean the air and fuel filter thoroughly. Fuel filters should be replaced after 10,000 miles. And air filters need to be replaced after 20,000-30,000 miles.
  • Keep the tires inflated properly. Check the tire pressure at least once a week and inflate them according to the instruction manual.
  • Avoid overloading the vehicle. Carry slightly below the load limit to improve mileage.
  • Don’t carry loads that affect the aerodynamics of the vehicle. It will help you improve the mileage.
  • Avoid erratic acceleration and braking. You can turn the engine off when idling for more than two minutes to save fuel.
  • Don’t over-rev the engine. It affects the fuel mileage.
  • Avoid installing larger tires or altering suspensions. These can cause poor fuel economy.

You May Like This Article: What Does P1316 Code On 7.3 Powerstroke Indicate


Here are answers to some frequently asked questions about 7.3 liter powerstroke engine fuel mileage. Check them out.

Are 7.3 Powerstroke gasoline engines better than diesel?

No. Diesel engines are more powerful than gasoline engines. And 7.3 Powerstroke diesel engines have a slightly higher mileage than gasoline engines.

Does oil change affect fuel mileage on 7.3 Powerstroke?

Of course. Engine oil keeps components running with less friction, so the engine performs better. According to Ford, you should change the oil after 7,500 miles in a 7.3 Powerstroke engine.

Do fuel additives improve MPG on 7.3 Powerstroke?

Yes, fuel additives clean engine components to deliver a better performance. And they can increase the mileage of your 7.3 Powerstroke engine by 1 MPG.

What is the ideal speed for the best fuel mileage?

You should drive the vehicle under 70 miles per hour on the highways and 40 miles per hour on city roads to gain the best fuel mileage. Also, you need to keep the RPM below 1800 to achieve the best mileage.

Key Takeaways:

Fuel mileage is one of the biggest concerns, especially while using older engines like 7.3 Powerstroke. There are several facts also affect the mileage. By the way, as a powerful old engine, the mileage it provides almost ok. Following the best practices regarding driving and maintenance may help you improve the fuel mileage.

Take the followings as key points about the 7.3L Powerstroke mileage discussion.

  • The engine gives an average mileage of 10-12 on city roads. The mileage slightly increases on highways at 12-14 MPG.
  • 7.3 Powerstroke fuel mileage depends on several factors, such as driving habits, vehicle load, tire pressure, tank capacity, etc.
  • Various model years of the engine can have different mileage. And older models have slightly less mileage.
  • Following the best practices can help you improve your mileage.

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