How To Get Better Fuel Mileage In A Diesel Truck?

  • Turn off the engine. Excessive warm-up times can deplete diesel fuel consumption, therefore avoid idling to save money.
  • When possible, use shore power. This is also known as truckstop electrification, because it allows drivers to plug in instead of idling, which helps to keep the vehicle cool while parked. Shower power is projected to save as much as $3,240 per year!
  • The engine should not be revved. Slowly transition to your next gear rather than as quickly as feasible. It’s a little less enjoyable, but it’s also a lot less expensive.
  • Find the sweet spot of your engine and ride it. Operating at the peak torque zone once you’ve reached your cruising speed provides you the most horsepower and diesel fuel mileage.
  • Make the most of your air conditioner by using it as little as possible. Running the air uses fuel, so if you can prevent it to save money, do so.
  • Be aware of approaching traffic signals. It is possible to save fuel by avoiding a complete halt. You’ll use less fuel if you can see the light is going to turn green and you can safely slow down without stopping.
  • Maintain a safe gap between you and the vehicle in front of you. The further you are from the vehicle in front of you, the less likely you are to have to stop. Stopping less also means avoiding excessive acceleration caused by braking.
  • Reduce your highway speed on a regular basis. While it may seem counterintuitive to get there faster, every mile per hour beyond 55 reduces your fuel economy by 0.1 miles per gallon.
  • Don’t slam on the brakes. To avoid fuel burn spikes, use smooth, constant gasoline acceleration.
  • Make use of your cruise control. You can avoid using the throttle to climb hills by utilizing cruise control to maintain a constant pace.
  • Use truckstops at the top of slopes if at all possible. Stopping at the top of a hill allows you to gradually return to the highway downhill, using less fuel. Alternatives can be found using the Multi Service Fuel Card truckstop locator.
  • When not utilizing cruise control, avoid accelerating excessively. Allow the truck’s momentum to carry it over the top of a hill to avoid slamming on the gas pedal too hard.

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Why is my diesel using so much fuel?

A malfunctioning engine is the most extreme condition that an automobile could be experiencing. A damaged engine is unable to function effectively, resulting in increased fuel consumption. You could be thinking that the engine can’t be bad if the automobile has just driven a few kilometers. You are correct. The engine itself may be in good working order, but the critical components that contribute to the combustion cycle may be malfunctioning. A malfunctioning spark plug or O2 sensor in a petrol engine, or a filthy fuel injector in a diesel engine, for example, might result in increased fuel consumption and low fuel mileage. For a while, your engine may run normally, but the fuel will not be burned efficiently. Your car will eventually consume more petrol than usual as a result of this.

Why is my diesel truck getting bad mileage?

The flow of fuel into the engine might be severely hampered by a faulty fuel injector or a dirty/old fuel filter. One of the most prevalent causes of poor gas mileage is an issue with the fuel system. The more you use your air conditioner, the poorer your gas mileage will be.

Can you tune a diesel for better mpg?

“Do you have any tuner goods that can help me conserve gas and possibly get a bit more power out of my car?”

First and foremost, I like to find out if the car is mechanically okay when I speak with clients who are experiencing poor fuel efficiency. In your situation:

  • Has the truck’s suspension and steering parts been recently inspected or serviced?
  • Have the filters and fluids on the trucks been changed in a timely manner?
  • Have you checked or tested your truck’s turbo system and intercooler pipework for boost leaks?
  • Is the truck’s emissions system (EGR and DPF, if installed) working properly?

If everything seems good, we’ll move on to the truck’s present setup and driving habits.

In your instance, you’re defying all principles of aerodynamics; your truck will never attain 20 to 25 MPG since the resistance it faces is too large; your options are to go with a smaller tire size and lift or accept a lower fuel economy.

Assume you don’t have a lift or large tires, and your aerodynamics are in good shape.

Do you prefer to slam on the brakes at every green light, or do you live for the rush of a motorway on-ramp? (Of course, I’m guilty of this!)

If you answered yes, you can change your driving habits and observe an improvement.

Now, to directly answer your question, we do provide tuning products that often result in increased fuel economy. Installing a correctly crafted tune or collection of tunes will usually result in a 1-2 MPG boost.

Some people may see more, while others may see less; because to the variables described above, over which we have no influence, we cannot guarantee any increase in efficiency.

In a controlled setting, as a vehicle’s horsepower grows, it requires less throttle input to spin the tires over each time, resulting in increased fuel economy.

How can I get better gas mileage in my 6.7 diesel?

Changing your personal driving habits is the simplest method to improve your fuel mileage. Aggressive driving, excessive idling, and driving at speeds higher than recommended can all reduce your fuel mileage. Drive carefully and pay attention to the instruments on your dashboard when you’re driving. RPM is an excellent indicator of how hard you’re pushing your engine, and it’s placed near the gauge that shows your current speed. You want to stay clear of the red zone on your RPM gauge, which indicates that you’re revving too fast. Maintaining a lower needle on the gauge will result in higher fuel economy. If you have to accelerate while driving, do so gradually. You can lower your RPM by pressing on the pedal more slowly.

How do I fix high fuel consumption?

There are several strategies to cut down on your fuel consumption.

  • Keep your tires inflated. Underinflated tires have a greater rolling resistance on the road.

Upgrade the Air Intake

Improving the airflow to the engine is a surefire technique to boost a diesel vehicle’s performance. More air will reach the engine using an enhanced air flow kit, resulting in increased power.

In addition, the new airflow kit will pull air from outside the engine compartment, bringing colder air in. The amount of power produced by the engine will rise because cooler air is denser and holds more oxygen.

An enhanced air flow system can boost horsepower while also improving fuel economy.

Change or Reprogram the ECM

Engine performance is controlled by the Engine Control Module (ECM), which alters critical engine parameters such as the air-fuel mixture and maximum RPM.

You may easily change these settings by reprogramming or changing the ECM. This will allow the engine to create more horsepower and torque, which will increase performance.

ECM upgrades not only increase power, but they also help to increase diesel efficiency.

Using New Fuel Injectors

The next step is to upgrade the fuel injectors if you’ve improved the air flow to the engine and set up the ECM to produce additional power.

More fuel will reach the engine thanks to new fuel injectors, resulting in increased horsepower. Individual injector nozzles are found on most performance fuel injectors, which provide higher pressure and better atomize the fuel.


Adding extra power to diesel engines using a performance turbocharger is a wonderful way to do it.

The turbo operates by pressurizing the air intake and forcing additional air into the engine. It is possible to generate more power while improving engine efficiency by using a turbo.

In comparison to a non-turbo engine, a stock turbo boosts air flow three to four times. A performance turbo, on the other hand, can enhance airflow by five to ten times over a non-turbo engine, resulting in a bigger horsepower boost.

Performance Exhaust

You’ll need to update your exhaust system if you want to increase the engine horsepower.

Unlike factory exhaust systems, which are designed to reduce noise, a performance exhaust system will have a wider diameter and fewer bends, allowing for more exhaust flow.

A broader, straighter exhaust system will help reduce exhaust gas temperature and boost the engine’s horsepower and torque.

Why do diesels get worse mpg in winter?

Wind, snow, rain, and temperature are some of the most influential factors throughout the winter months. Crosswinds and headwinds dramatically increase aerodynamic drag, reducing fuel economy. Fuel efficiency drops by as much as 13% for every 10 mph of headwind or crosswind.

As the temperature of the ambient air drops, the air becomes denser, increasing aerodynamic drag. Aerodynamic drag increases by 2% for every 10 degrees Fahrenheit reduction in temperature. Every 2% increase in aerodynamic drag results in a 1% reduction in fuel economy.

Fueling stations will convert to winter mix fuels throughout the cold winter months. Winter blend fuels contain additives that prevent diesel fuel from gelling at high temperatures. These additives lower the cetane level of the fuel, resulting in a loss of one-half to three-quarters of a mile per gallon in fuel economy.

We find a considerable increase in the amount of time the engine cooling fan is operating during those extremely hot summer days. To run, a typical diesel engine needs between 15 and 30 horsepower. When the cooling fan is turned on when the engine is operating at 1450 rpm, the fuel efficiency drops by 8% to 12%. The primary function of the engine cooling fan is to keep the engine from overheating, but it also serves as part of the cab’s air conditioning system. When the A/C Freon compressor is turned on, a signal is sent to the engine cooling fan to turn on as well. The operation of the A/C Freon compressor accounts for approximately half of the overall fan run duration. Excessive engine cooling fan run duration might be caused by a malfunctioning A/C system.

We find an increase in engine idle time in extremely hot or cold weather to keep the cab and sleeper comfortable or cool. Idle time can have a big impact on your fuel economy. One gallon of fuel can be consumed every hour by a diesel engine running at 1000 rpm. Idling an engine for 8 hours at today’s gasoline costs may cost you $30.00. In a long-haul operation, every hour of idle time reduces fuel efficiency by 1%.

Because the tires must push their way through the precipitation on the road in addition to propelling the car, rain, snow, or slush on the road increases the vehicle’s rolling resistance. The tires, transmission oil, and axle oils are all cooled by the rain. At lower temperatures, these components perform less efficiently. In just a moderate rain, the additional rolling resistance and drive-train friction can increase fuel consumption by 0.2 to 0.3 mpg.

There are numerous factors that have a negative impact on fuel economy that are beyond our control. As a result, it’s critical that we maximize the efficiency of everything under our control in order to achieve the best possible fuel economy.

Are diesel tuners worth it?

Will a Tuner Help Me Save Money on Gas? Yes, a tuner should theoretically improve your truck’s fuel economy by enhancing engine efficiency. The highest fuel economy advantages are often seen with tunes ranging from 65 to 90 additional horsepower. This is not the case all of the time, however.