Best Diesel Tuners for 6.7L Cummins (2007.5 – 2020 Models)

| Last Updated: December 24, 2021

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Let’s face it, driving a diesel truck is just plain awesome. But what if we told you there was a way to make that experience even better? Read on to learn more about diesel tuners and the many ways they can take your Dodge’s 6.7L Cummins engine to the next level.

Comparison of the Best 6.7L Cummins Tuners

  • Upload speed is always under two minutes
  • Gauge brightness and auto dimming works well
  • Provides enhanced drivability, power, and fuel economy
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  • Good at monitoring truck performance while towing
  • Will continue to perform at high quality for a long time
  • Great for watching your truck’s vitals during a lengthy trip
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  • Can even out a truck’s speed and torque
  • Awesome at maintaining power while going up hills
  • Delivers noticeable power gains that are still completely safe
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  • Allows the truck to speed up much faster
  • Can provide an eight mile increase in miles per gallon
  • Makes the truck move through gear changes more smoothly
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What Years Fall Under 6.7L Cummins?

Dodge put 6.7L Cummins model engines into many of its trucks over the years, and it is tuners compatible with these engine types that we evaluated in this article. Dodge was putting 6.7L Cummins engines into its trucks from midway through 2007 (2007.5) up until 2009, and then adjusted to a new type of 6.7L Cummins engine starting in 2010, and running all the way up to its newest models, the 2019 Rams.

How Do Tuners Help with Fuel Economy?

Think of the relationship between your truck and its tuner the way you think of the relationship between you and your morning coffee – you probably don’t need it to function, but it certainly helps you function much better! When you install a tuner in your truck, it improves your overall engine performance, which will have a noticeable impact on the fuel economy. The only bad part about owning a truck is the cost of gas, so any little bit will help.

Aspects to Consider Before Buying a Cummins Diesel Tuner

A diesel tuner can be a pretty big purchase, so you will want to keep certain things in mind before you buy:


If you are going to pull the trigger on a diesel tuner for your truck, you should definitely have the options to make it your own and provide yourself with the very best diesel tuner experience. Make sure you get yourself a tuner that you can customize in terms of screen layout and vitals measured.

Enhanced Power

The main reason you are getting a tuner is to make your truck the very best it can be, right? Find a tuner that can unleash the full horsepower of that 6.7L Cummins engine, even when you are towing or going uphill. You will not regret it.


Tuners are a pretty big investment to make – so make sure you get yourself one that is going to monitor absolutely everything about your truck, from its fuel efficiency to its injector balances. You will never have to wait around for a mechanic to tell you what is going on with your vehicle if you’ve gotten the right tuner.

Review of the Best Diesel Tuners for 6.7 Cummins

Now that you know a bit more about diesel tuners for 6.7 Cummins engines, let’s look at some actual products:

Best Overall:
Mads Smarty Touch Tuner SG2


  • High quality
  • Rapid upload speed
  • Versatile and customizable
  • Has a wide variety of functions
  • Brightness/dimming features work well


  • Does not come with much information on all of the features available for later model Ram trucks

The Mads Smarty Touch Tuner SG2 combines all the intelligence of a Smarty programmer with an incredible gauge display so you can easily keep track of everything that is going on with your truck – and every way this tuner is making your truck more efficient and powerful!

The Smarty Touch Tuner has a multitude of different functions, and is guaranteed to improve your truck’s drivability, power, AND fuel economy – as well as making your truck ride more smoothly and feel more under control, even with enhanced power.

This tuner is extremely simple to install and to use so that you are always aware of everything that is going on with your truck. It even comes with additional TNT-r software – just reach out to Smarty after purchasing and they will send you an access code.

Bottom Line

The Mads Smarty Touch Tuner SG2 is an excellent tuner for anyone with a Cummins engine – it will take your truck to the next level for sure. It may take a bit of self teaching and learning to figure out all of the features it has for newer Ram models, though.

Best Monitor Only:
Edge Insight CTS3


  • Light
  • Durable
  • Versatile
  • Intuitive to use
  • Comprehensive


  • Can take a while to start up

The Edge Insight CTS3 is a fantastic tuner that will keep track of absolutely everything you would ever want to know about your truck, from the exhaust, to the engine, to the transmission, to the fuel rail pressure, to the injector balances – you name it, and the CTS3 can get you data on it!

This makes the CTS3 particularly useful in situations that could be unusually strenuous for your truck, such as making a long distance road trip, or towing another vehicle (or towing another vehicle while on a long distance road trip…).

It provides a large screen that is easy to interact with and provides all the information you could ever need in an awesome interface. There really is not much you will not be able to discover about your truck’s performance when you go with the Edge Insight CTS3.

Bottom Line

The Edge Insight CTS3 is a great tuner that will provide you data on everything you would ever want to know about your truck, especially in more intense situations like towing where you want to measure the impact on your truck’s performance. The only drawback is it can take a while to start up when you turn the key in the ignition.

3. Bully Dog GT Platinum Diesel Tuner 40420


  • Versatile
  • Lightweight
  • Easy to install
  • Bully Dog provides good customer service
  • Delivers noticeable (but safe!) power gains


  • Will not be immediately ready to go upon arrival – requires a call to the Bully Dog tech team to activate

The Bully Dog GT Platinum Diesel Tuner 40420 is an excellent tuner that can help you maximize the full, untapped power of your truck with its connection to a truck’s unlock cable. Once you are maximizing your truck’s power, you will see a noticeable difference in many aspects of your truck’s performance.

Your truck will no longer shift to a lower gear while going up hills, but instead be able to maintain its speed. Your vehicle’s speed and torque will even out. You will even see an increase in miles you are able to get per gallon – some users reported up to a four miles per gallon increase!

That is a big deal when you are not exactly driving the most fuel efficient vehicle on the market – a bump from thirteen miles per gallon to seventeen miles per gallon will pay for the cost of this tuner in no time with the saved gas money you will not be spending.

Bottom Line

The Bully Dog GT Platinum Diesel Tuner 40420 is a fantastic tuner for increasing your truck’s power, miles per gallon, and honestly, just its overall awesomeness! There is a minor inconvenience when installing this tuner in that you will need to call Bully Dog to activate it, but that is a small price to pay for all its benefits.

4. Mads Smarty S-67 Programmer


  • Ships quickly
  • Easy to install
  • Provides fast downloads
  • Instructions are easy to follow
  • Provides an increased throttle response
  • Smarty provides great customer service


  • You may need to download an update before the device will initially work

The Mads Smarty S-67 Programmer is one of the most effective tuners on the market for increasing your truck’s power and speed. One user reported that this little guy was able to make their truck go from zero miles per hour to sixty miles per hour in just eight seconds!

Smarty provides an aggressive ramp-up that allows the truck to increase its speed very quickly, much faster than other available tuner models. And this increase in speed is also matched by an increase in fuel efficiency: users say that the Smarty was able to bump their miles per gallon up by almost eight miles on the freeway, and around three or four miles for surface street driving – even when driving while towing a trailer. You really cannot get more fuel efficient than that.

Bottom Line

The Mads Smarty S-67 Programmer is an ideal tuner for walking the line between an increase in power and an increase in fuel efficiency. There may be a time lag between when you get the device and when you are able to use it due to some devices requiring updates, but that is a minor blip you will have to deal with only once.

Benefits of Investing in a Great 6.7 Cummins Diesel Tuner

There are some tuners in the market that are definitely head and shoulders above their competition. Here’s why you should invest in a good tuner and not a cheaper model:

Fuel Economy

The thing about great tuners is that they usually end up paying for themselves pretty quickly in terms of saved gas mileage. If you bump up your truck to just a few more miles per gallon using a tuner, you will be hitting the gas station far less.

Improved Performance

A good tuner will make it so that your truck is always maximizing its capability no matter what you are asking it to do for you – and we all know we ask our trucks to do a lot, from hauling heavy loads to pulling trailers. A tuner will make your truck into even more of a beast.


This is an admittedly less sexy aspect of using a fuel tuner than fuel efficiency or improved performance, but it is certainly one of the most important! Using a great tuner will help you know your truck much better, so it will be easier for you to spot whenever something is even slightly off. This will translate into increased safety for you and your passengers.


Tuners are really a game changer when it comes to a Dodge 6.7L Cummins engine – from increased fuel efficiency to enhanced power when hauling a trailer uphill, there is not much these can’t do! Invest in a diesel tuner today, your truck will definitely thank you.

Sean comes from the forums actually and drives an OBS Ford. He writes fantastic DIYs and knows his way around a camera, too. We keep him caffeinated and away from DPF filters to avoid another rant about recent emissions restrictions.