Skip to Content

F150 Getting Bad Gas Mileage: How to Fix

F150 Getting Bad Gas Mileage: How to Fix

With a seemingly endless uptick in gas prices, truck owners are hurting. And to discover that your F150 is getting worse and worse gas mileage is just salt to the wound. The good news is that truck owners don’t have to suffer through this nuisance. There are many possible causes for a sudden drop in gas mileage, and each issue has a solution.

Poor gas mileage in an F150 can be caused by simple issues, such as incorrect tire pressure or using the wrong motor oil. However, some problems are more severe and must be treated by a professional, such as misfiring spark plugs, dirty fuel injectors, or a dirty oxygen sensor.

If you’re tired of seeing your car fuel gauge plummet after each fill-up, you need answers – and fast. Keep reading to discover why your truck is suddenly getting such bad gas mileage and how you can fix it to get things back on track.

Why is My Truck All of a Sudden Getting Bad Gas Mileage?

Although the gas mileage of your F150 can depend on many factors, such as the number of cylinders, these trucks traditionally get around 18 to 25 miles per gallon. But if your truck is suddenly blowing through gas like there’s no tomorrow, it’s a clear sign that something has gone haywire.

This leaves F150 owners begging the question, “Why has my gas mileage gotten so bad?”

Here’s a quick video showing how to check some quick things. Much more info below:

Here are a few of the top reasons why your F150 is suddenly getting lousy gas mileage and how to fix it.

Incorrect Tire Pressure

The most common (and easiest to fix) cause of sudden poor gas mileage is incorrect tire pressure. Before considering any of the other possible causes, double-check your tire pressure levels. If they’re low, fill them up ASAP. If they become low soon after, check your tires for problems, such as a hole in the tire.

Misfiring/Dirty/Poorly Performing Spark Plugs

Spark plugs are in charge of sparking the combustion in your engine, hence the name “spark plugs.” Your gas mileage can decrease if they’re misfiring, dirty, or otherwise performing poorly. You may also notice a struggle with starting up your F150 and sluggish acceleration. If this is the case, have them checked by a professional.

Check out these popular F150 Accessories Found Here on Amazon

Dirty Oxygen Sensor

When it comes to the mechanics of your F150, nothing should be “dirty” – especially your oxygen sensor. This sensor measures the richness/leanness of the exhaust gasses, adjusting the amount of fuel that enters the engine. If it’s dirty, it will lead to a loss of gas mileage, among other issues like a rough idle.

Dirty Fuel Injectors

Dirty fuel injectors are also causes for concern, as a clogged system will not allow enough fuel to be sprayed into the cylinders. As such, the gas mileage will decrease, and you may notice your F150 has lost some of its power. Like the dirty oxygen sensors, these may simply need to be cleaned, although they may need to be replaced outright.

Worn Out/Stuck Brakes

Brakes that have seen better days may cause issues with your MPG. When brakes are worn out or sticky, they’ll cause resistance to your truck. In turn, your truck is fighting to push forward, leading to a significant drop in fuel efficiency. If you’re having trouble with your brakes, have them checked and removed as soon as possible.

Bad Oxygen Sensors/Air Filters

Did you know that bad oxygen sensors/air filters can lead to a 20% decrease in gas mileage? Needless to say, a dirty oxygen sensor or air filter is a definite no-no for your F150. Have these areas checked out by a professional and replaced when necessary.

Running the AC or Idling

During summer, people tend to turn their air conditioners on to escape the heat. On the other hand, F150 owners may idle their cars during winter to warm them up before taking off. Unfortunately, both of these situations lead to decreased gas mileage.

Incorrect Motor Oil

Using the wrong type of motor oil for your F150 can also lead to a 12% loss in gas mileage. With that in mind, always make sure you’re using a synthetic or synthetic blend high in friction reduction. (Otherwise, use what your owner’s manual recommends.)

How Do I Get the Best Gas Mileage in My F150?

Most people want the best gas mileage from their trucks, and F150 owners are no exception. Luckily, there are many ways to improve your truck’s gas mileage and keep your F150 in tip-top shape.

Check Your Tire Pressure

Low tire pressure is responsible for a large percentage of sudden poor gas mileage incidents. Don’t be a part of the statistic – make sure your tires are adequately filled. As an extra measure, double-check that they’re aligned, as misaligned tires can also spell trouble for your MPG.

Improve Your Driving Habits

Sudden acceleration and incessant, harsh braking are not only damaging for your F150 but can cause your fuel efficiency to tank. That said, it’s time to improve your driving habits. The smoother your ride, the better.

Remove Heavy Items

Although your F150 is the ideal truck for transporting large and heavy goods, the added weight can bear down on your gas mileage. Remove it ASAP.

Limit Idling and AC

Idling and air conditioner use cause a drop in gas mileage. The easiest way to fix this is to stop idling and using the air conditioner when possible.

Use the Right Motor Oil

Always make sure you’re using the correct motor oil for oil changes. Double-check with your manual to ensure you’re using the right one. (Tip: it’s likely going to state synthetic or synthetic blend. If you’re not sure, ask your mechanic.)

Replace Dirty/Clogged/Misfiring Parts

If you think your plummeting MPG has something to do with the spark plugs, oxygen sensor, brakes, or other areas of your truck, it’s essential to have them looked at by a professional mechanic. Ensure that you’re taking your vehicle in for regular maintenance, and always have your F150 looked at if something is amiss.

Check out these popular F150 Accessories Found Here on Amazon

Plummeting Gas Mileage Can Be Resolved!

Don’t suffer from bad gas mileage. Have your F150 checked for issues such as dirty fuel injectors and sticky brakes. When your truck has been looked over, and items have been cleaned or replaced, limit idling and AC use, improve your driving habits, and always keep your tires aligned and filled.

Sharing is caring!