Ecoboost Gas Mileage Problems (5 Integral Reasons)

We wonder how long you have been having a great time with the EcoBoost engine. Since Ford is an incredible machine, its durability should be higher also. 

However, a driving disruption can happen at any time. This may frustrate you.

So, what is causing the EcoBoost gas mileage problems?

A lower fuel economy can be a primary reason alongside dirt accumulation in the system. Furthermore, an old engine alongside rising sensor problems can be the reason as well. It is good not to overlook the failing and leaking exhaust system. The right repair or replacement is needed for the fix. 

We, therefore, invite you to pay closer attention to the reasons highlighted later. By understanding the scenarios, you can apply the right solutions. 

Let us begin with some necessary insights!

Reasons Behind Gas Mileage Problems

A common scenario is that you would be driving close to 80,000 to 100,000 miles. This is within five to seven years after you bought the Ford. 

It is evident that an EcoBoost gas mileage drop would happen within the time frame. 

In the case you are experiencing the issue before, there should be manufacturing defaults. This means you have to replace parts sooner than expected. 

We are providing a scenario where the problems would arise within 5 to 7 years. A usual fact is that at times you have speeded above the normal range. This can cause several overheating issues. 

Any problems within the internal system of the vehicle would create gas mileage problems.

We have explored five reasons in-depth to figure out the reasons. 

Reason 1: Lower Fuel Economy

As mentioned earlier, speeding too much too often can cause internal issues. The high-end ford parts are extremely sensitive. If you have been driving aggressively, you have not done justice to the car. 

You would be asking why is my f150 getting bad gas mileage. This is because it has been a long time since you have serviced your car. 

Probably you have not checked your engine performance and its fuel delivery more often. As a result, you are experiencing gas mileage problems. 

It is evident that low fuel economy happens when there are issues with several parts. This means the wires and injectors are not able to transfer fuel properly. The pressure created due to overheating or other factors is lowering the efficiency. 

A common indication is around a 20% to 40% drop in fuel efficiency. 

As a matter of fact, the efficiency of the fuel injectors plays a vital role here. An even balance of air pressure can cause the injector to default. When this happens, you would experience problems speeding up while driving. 

The injectors would depreciate over time. As rust and corrosion become common factors over time, efficiency issues may just surface. 

Reason 2: Internal System Dirt Accumulation

In this article, we are discussing higher probable scenarios. As you are reading the contents, situations can be different. This is based on where you are living and how you are driving the car. 

By keeping the probable scenario in place, we are using a dirt accumulation point. There are several causes of dirt and corrosion in engines and other parts. 

This means we are assuming you have not cleaned your internal parts for a long time. When you take your car for servicing more often, a good wash is done. This is to remove all the dust from the system.

As dust formation grows dense, several parts would start to corrode. As a result, performance issues arise. 

Also, notice what kind of climate the area where you live has. Any extreme conditions can make the interior of the car overheat. Be it extremely cold or extremely hot.

These days, western temperatures are rising above 40 degrees Celsius. It is good to invest in car maintenance when the weather is hard to absorb. 

Generally, dealing with internal moisture formation is something these cars can’t do. 

Reason 3: Old Engine Issues

An engine lifespan should be around 7 to 10 years. This is to assure a driven mileage closer to 200,000 miles. However, as pointed out before, engine issues may surface earlier.

This is due to the causes highlighted before. You definitely want the best mpg 3.5 Ecoboost. But it is not happening as the old engine is not able to use fuel delivery efficiently. 

MPG is indicated by miles per gallon. This means it shows a performance indicator of how many miles the car can go. This is in terms of per gallon of fuel. 

A healthy engine should deliver around 60 MPG. Any number lower than that means the engine health is going down. 

We have assumed that several parts of the car’s interior are dirty. In a specific scene, the air filter that directs the engine performance can be dirty. The air filter may start to clog creating air pressure inside the system.

As a result, you would be facing problems speeding up while driving. 

Reason 4: Problems With The Sensors

Sensors are very important parts that drive the vehicle’s performance. The sensors direct information to several parts of the car. This happens when you start the engine and start to accelerate. 

A defaulting sensor is one of the main reasons behind EcoBoost gas mileage problems

When you are pressing the accelerator, the information is carried out by the sensors. When sensor issues arise, the information flow would disrupt. This means the interiors are unable to balance the pressure created by you. 

Basically, the sensors are responsible for calculating computer data. The data determines how much fuel pressure is required for the engine to run smoothly. A defaulting sensor would interrupt the data transfers.

Facing gas mileage problems while driving means you need to stop the car. This is because as the situation worsens, brake failures can happen. 

You should ask how sensors create gas mileage problems.

Out of the many sensors, the main problem can stay with the oxygen sensor. The engine runs well with the oxygen sensors that manage fuel distribution. A faulty oxygen sensor will make the engine burn more fuel than usual. This means you are losing more fuel than usual causing the car to drop MPG.

As you can see, every reason is related to one another. 

We will explore more in the last reason. 

Reason 5: Exhaust Leak

A promotional promise of the 3.5 EcoBoost engine is 450, 000km of driving. In terms of miles, it is higher than 250, 000. It is commonly seen that faulty internal parts appear before the 200,000 miles mark.

An exhaust leak contributes to high mileage 3.5 EcoBoost problems. The exhaust pipe is connected to the internal parts of the system. As the parts go faulty, the pipes create uneven pressure causing the exhaust to leak. 

The job of the exhaust is to prevent noise from coming from the combustion chamber. An exhaust leak would make the car make a buzzing noise. This is when you turn on the engine.  

It is important to note that you should not keep driving. This is when the car’s warning lights are on. This would happen when the internal power distribution is not in balance.

An exhaust leak can be visibly detected when you inspect the car. 

Repair And Replace To Increase Gas Mileage

The solution to the gas mileage problem depends on the repair or replacement scene. When you take your car to the garage, you can easily clean up the corrosion. 

However, it is good to replace the injectors, gaskets, or exhaust pipes. This is to ensure the long durability of your vehicle. 

A 3.5 EcoBoost fuel economy tune would improve engine performance. This would deliver better fuel economy alongside enhancing the torque. 

After carrying a proper servicing you should get back to enjoying the drive. 

We have a product suggestion chart for you.



What should I do to prevent corrosion in internal parts?

The best idea to prevent corrosion is to do a chemical cleaning. Paint and plastic coating is also a good idea. Check with your technician to determine the best solution. 

Should I replace the air filter for the best engine performance?

Yes, it is a good idea to replace air filters for the best engine performance. You would be able to solve gas mileage problems by doing so. You should also be changing other parts such as the oxygen sensor or fuel injector. 

What is the advantage of fuel economy tune?

A fuel economy tuning with the engine will give you a clean burn. When the burn is clean, engine efficiency and power would be higher. This would contribute to better gas mileage. 


We have assisted you with 5 reasons for EcoBoost gas mileage problems. We hope we will be able to treat your car in the nicest way possible.

Wishing you all the best, we are signing off. 

Rob Dahm

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