How To Make A Diesel More Fuel Efficient?

  • 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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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.

At what speed is a diesel engine most efficient?

With today’s gas rates, getting the most miles out of each gallon is a top priority. The amount of gasoline you use in a given day is determined by a number of things, one of which is your Cummins Turbo Diesel. When driving your 6.7L Cummins RAM, a few simple changes may help you save money on petrol.

To put it simply, the more work your engine accomplishes, the more fuel it consumes. Tire tread, acceleration rate, cruising speed, air conditioner usage, aerodynamics, excess weight, and idle time, to mention a few, all have an impact on how much extra work your truck accomplishes.

Let’s look at how speed affects the quantity of fuel you use today, in particular:

In general, the higher the engine speed, the more fuel the engine consumes. The most fuel-efficient engine speed is between 1,300 and 1,500 RPM, or what some call the “sweet spot.”

When travelling on the highway, aerodynamics play a significant role in the amount of effort necessary to move the vehicle. You have two alternatives for reducing the workload: improve the aerodynamics of the truck or slow down. You lose around 1 mpg for every 10 mph you go above 55, so staying below the posted speed limit not only keeps you safe and avoids tickets, but it also saves you money on gas.

Acceleration is straightforward physics: the faster a load is accelerated, the more force is required. One method to waste gasoline and money is to speed away from a green light. Rapid acceleration also involves pushing the engine rpm higher into each gear’s less efficient engine speeds. You should gently up through the gears and upshift as quickly as feasible when accelerating. If you have an automatic transmission, accelerating slowly permits the transmission to upshift at the lowest feasible rpm. Unless you’re going to the diesel drags, take it easy and save some money.

Should I put additive in my diesel?

While the country’s diesel fuel supply is generally reliable, it is not always consistent. When constructing and certifying diesel engines, manufacturers take into account quality swings. In general, they oppose or advise against the use of fuel additives.

“We do not advise Volvo truck owners to add additives to their diesel fuel.” If additives are required, they should be added at the gasoline supplier terminal, according to John Moore, Volvo Trucks North America’s powertrain product marketing manager.

Last year, Cummins became the first company to publicly support a fuel additive, endorsing two Power Service products, Diesel Kleen + Cetane Boost and Diesel Fuel Supplement + Cetane Boost.

“Cummins engines are designed, developed, graded, and built to certify and function efficiently on commercially available diesel fuel,” according to Josh Hahn, Cummins Filtration’s coolants and chemicals business leader. “However, Cummins acknowledges that there are low-quality fuels on the market that don’t always meet ASTM D975, and that these fuel concerns can cause a range of problems for customers, including poor lubricity, low cetane numbers, low-temperature operability issues, and injector deposits.” When pour-point depressants, wax-crystal modifiers, or de-icers are required in cold weather operations, fuel additives may be required.”

“In recent years, diesel fuel quality has become increasingly critical as engines evolve and the diesel fuel manufacturing processes change,” said Roger England, director of technical quality and materials engineering for Cummins, when the Power Service alliance was announced last year.

That’s easy to comprehend when emissions regulations tighten and engine technology advances, resulting in tighter mechanical and engineering tolerances. In summary, because fuel supply uncertainty is unlikely to improve, engine manufacturers such as Cummins are taking steps to level the playing field.

Meanwhile, Detroit Diesel says it has no additional requirements beyond current ASTM specifications, but recommends that customers take steps to ensure they are utilizing high-quality gasoline.

“While Detroit does not directly advise any brand or type of fuel additive, we recommend Top Tier diesel fuel since it addresses many of the flaws in ASTM regulations addressing diesel fuel quality,” says Jason Martin, HDEP thermodynamics and fuel map management manager at DTNA. “Top Tier is a voluntary retailer program that addresses fuel stability and lubricity, as well as detergency, water, and particles – factors that help sustain the fuel system’s performance over the engine’s lifespan, which is a contributing factor to ensuring top engine performance.”

In North America, Top Tier diesel is available from a variety of vendors. “Because shops may also offer non-additized diesel fuel or diesel that does not satisfy the Top Tier regulations,” the website warns, “always verify the dispenser.”

How do you maximize fuel efficiency?

You consume more fuel and spend more money than you need to when your speed dips and explodes. According to tests, altering your speed between 75 and 85 miles per hour every 18 seconds can raise your gasoline consumption by 20%.

If the road conditions allow, use cruise control on the highway. However, keep in mind that when gravity is at work, little differences in speed might actually be beneficial. Allow your speed to decline as you drive upward when traffic patterns allow, then regain momentum as you roll downhill.

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.

Do tuners increase mpg?

Is it possible to boost the performance of your diesel pickup truck with an engine tuner (chip, module, or programmer)? Yes, in a nutshell, but a more detailed explanation is required.

While aftermarket performance product makers say that aftermarket performance products can add 3-4 mpg, the real savings, if any, are highly dependent on how and where you drive. Performance goods, by definition, are intended to boost engine output. A plug-and-play Juice Attitude CS programmer from Edge, for example, is said to give 150 horsepower and 360 ft-lbs of torque to a Dodge Ram 2500 with a 6.7L Cummins engine (not advised for stock vehicles).

That’s great for smoking Corvettes off the line, but it’s not going to save you money at the gas station. Indeed, the greater horsepower may make it impossible to keep your foot off the accelerator, resulting in higher engine wear and stress on your transmission and drivetrain. Simply put, you risk reducing your truck’s lifespan, voiding the manufacturer’s warranty, and increasing your chances of being pulled over by the highway patrol.

An engine tuner, on the other hand, could be your best friend if you pull big equipment, climb mountainous terrain, or travel long distances.


Manufacturers like as Edge and Bully Dog provide a Mileage Coach to assist you evaluate, monitor, and reduce gasoline use to ensure you’re on your best behavior.

Bully Dog also makes digital watchdog gauges with speed limiter adjustments, diagnostic reader, and driving coach for Caterpillar, Cummins, Detroit, Mercedes, and Paccar engines, as well as an ECM tuner with economy tuning, economy/power tuning, and custom tuning for Caterpillar, Cummins, Detroit, Mercedes, and Paccar engines. The Caterpillar ECM tuner claims a 15 to 18 percent improvement in power and a 6 to 12 percent increase in fuel efficiency for fleet owners.

An engine tuner’s appeal is that it allows you to modify your truck in a variety of ways, from towing to off-road racing, all by flipping a switch or tapping a touch screen.

For example, the Edge Juice has six on-the-fly power levels (25 hp, 70 ft-lbs; 40 hp, 90 ft-lbs; 50 hp, 120 ft-lbs; 65 hp, 160 ft-lbs; 80 hp, 200 ft-lbs; and 150 hp, 360 ft-lbs), as well as a stock (level 0) setting when necessary. It has a 4.3-inch touch screen and an optional backup camera for simple trailer attachment.

The TS Performance Stryker Injector Duration module promises up to an additional 135 horsepower and 200 ft-lbs of torque, as well as 3-4 mpg benefits.

Engine tuners, as the name implies, tweak your vehicle’s computer settings for best performance, such as injection timing, fuel/rail pressure, and injector pulse width.

Engine tuners range in price from around $350 to several thousand dollars for Class 8 truck models, depending on the bells and whistles you want.


Jason Maki, owner of K & S Service Center in Weston, Wisconsin, provides a full line of Edge, Bully Dog, and H & S Performance diesel engine performance items.

“They all do different things,” he explains. “You get a bit more efficiency, a little more performance, and a little more economy.” And it is exactly what the majority of folks are seeking for.

“Diesel performance was a significant market in the late 1990s and early 2000s,” Maki recalls. “With simply a programmer, a module, or a chip, someone could get 50, 80, 100, or 140 horses out of their truck.” However, once you reach those higher horsepower levels, you’ll run into problems.

“You normally don’t see a problem for guys just seeking for economy, but for guys who want enormous power, you wind up having to do extra work on the engine and transmission.”

Even if today’s tuners are compatible with modern diesel emission systems, Maki claims that higher pollution rules, such as the usage of urea and diesel particle filters, have reduced demand for performance items in recent years. Keep in mind, however, that removing an emission system is unlawful unless the vehicle is being used off-road.

Maki has an engine tuner in his 2014 Dodge Ram 2500 with 6.7L engine, largely for additional efficiency, and claims that performance programmers can add a few miles per gallon and roughly 50 horsepower even with today’s tighter pollution rules.

Is it really worth spending $350 for a modest increase in fuel economy, especially with today’s lower fuel prices?


“He adds, “It depends on what you’re doing.” “Probably not if you’re just running around town. However, if you drive a lot of miles or travel for work, these devices can be useful. If you gain 2 miles per gallon and drive 500,000 miles, it adds up.”

Maki, a Cummins dealer, warns truck owners that installing an engine tuner may violate their warranty.

“He says, “We let them make that decision.” “But once they’re out of warranty, anything goes.”

Most engine tuners include a cable that may be run up the door seal to a window-mounted monitor and plug into the vehicle’s onboard diagnostics port beneath the driver’s side of the dash. It takes roughly 15 minutes to complete the installation.

When changing tire sizes, tuners can be utilized for engine diagnostics, performance testing, and speedometer calibration. They can also be updated via the Internet.

Maki advises speaking with a local dealer before purchasing an engine tuner on the internet.

Does chipping your truck improve MPG?

A performance tuner’s most common purpose is to boost horsepower, although chips can also improve fuel economy, throttle response, and torque for towing large loads.

What rpm should a diesel idle at?

Severe weather is the most typical reason for leaving a truck idle. Excessive cold and extreme heat can make it necessary for the driver to idle the truck in order to stay comfortable.

  • Start the engine at 900 to 1200 RPM and let it idle for a few minutes. This guarantees that the oil has enough pressure to reach the tops of the engine’s heads.
  • Open the windows or the bunk vents. This keeps the air in the cab clean and free of fumes. Fumes from the engine have been related to a greater cancer rate among truck drivers, as well as death by asphyxiation.
  • Look for any leaks in the exhaust system. During your morning pre-trip checkup, look for any exhaust leaks. Check any APU exhaust that has been improperly channeled and has accumulated underneath the cab or sleeper. I know of a truck driver in Arkansas who died lately from this identical condition while sleeping in his bunk.
  • For the optimal air flow, park the car. When it’s necessary to idle, try to park in the opposite direction of the wind. Any fumes lingering beneath the truck will be blown away by the wind.
  • Do not leave the truck running with the engine turned off.
  • If you need to get out of the truck, turn it off. Thieves are attracted to idling and empty trucks.

Idling a big rig should only be done in exceptional circumstances. However, it never ceases to amaze me how many truckers leave their trucks running all night when a blanket would keep them just as warm.