How to Get 30+ MPG With a Duramax

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Duramax owners may be interested in getting better gas mileage out of their trucks. Getting better fuel economy isn’t something that we think about when driving.

However, if you have a way to increase your fuel economy just by changing out a few diesel truck parts, it might be worth looking into. After all, keeping your current truck while getting better mileage is something everyone can get behind.

At first glance, most people would doubt that you could increase your payload with a Duramax diesel, but it’s possible to do so with aftermarket parts. Many of these same people drive down the highway on their trucks not realizing that their truck could be much more capable than what is currently installed and they aren’t utilizing everything they have in their vehicles

The best way to get 30+ mpg from your Duramax is to install a series of modifications that will make your truck more fuel-efficient. There are many modifications out there for your truck, and you can go to extreme measures like swapping an entirely different engine into this truck. It’s possible to improve gas mileage by making these emissions-related modifications to your truck.

Let’s discuss in detail how to get 30+ MPG with a Duramax from a different method.

How to Get 30+ MPG With a Duramax

Here are the different methods through with you can increase the gas mileage of your Duramax Engine. These are step-by-step instructions that anyone can follow, and you will be able to get more power out of your engine without sacrificing anything.

Replace the Parts with new Ones

Find high output modifications that will increase fuel efficiency on all of your modification parts. The easiest way to get better gas mileage is by purchasing new or used parts specifically built with this in mind. This is a good place to start, but there are other more specific areas you can look at if you want optimal results

Modify the Exhaust System

Get a new exhaust system, and this will not only function much better than your current one but will increase fuel efficiency. This is another simple modification that many diesel truck owners can do on their own without taking it to a shop or paying someone else hundreds of dollars for something you can do yourself.

Use the Right Fuel and Tune it Properly

This is extremely important no matter what kind of truck you have. You need to get the right fuel for your engine and tune it properly so that it runs efficiently. This will also make sure that it doesn’t pollute as much as possible while running on this fuel.

Modify the Engine Powertrain

Talk to your local mechanic and see what they recommend for modifications that will increase engine power and fuel efficiency. A lot of this depends on the year and make of your truck, so you need to be aware of all the available options.

Modify the Cooling System

Improved aerodynamics is one of the best ways to get better gas mileage. This is about as extreme as they come in terms of modifications, and you’ll see a big improvement. If your truck has an aerodynamic problem, then this could be a great way to fix it

Buy the New Engine

If your engine is too old and not working properly, Get a new engine or turbo system and this can increase your fuel efficiency. You will be surprised at how much more efficient these engines are, especially when you install all the parts needed to make it run better while still being able to get good gas mileage.

Modify or Replace the Transmission

You can improve your transmission efficiency by either modifying what you have(which is a lot easier than replacing it) or you can change it out with something else. If you do replace the transmission, make sure that an experienced shop does this so you don’t end up messing anything up.

Modify the Drive Shaft

You can change out the driveshaft, which will lower your truck’s gear ratio. This will help you get better gas mileage and give you more responsive acceleration. These are two things that diesel truck owners like to see in their trucks.

Modify the Suspension System

Get new lift kit parts so that your truck sits higher off the ground. This will improve your gas mileage, but combined with other modifications, it can make for a nice all-around truck that takes you anywhere you want to go and doesn’t cost much money

Modify the Radiator

There are some new radiator parts available which have improved efficiency on their own. You can do another modification to the radiator, which involves getting a better-quality unit for your truck.

Modify Exterior Components

There are many things you can change about your exterior components to get better gas mileage as well. The first thing you need to do is check out what parts are available for your vehicle so that you know if there are any modifications to your truck.

A Brief Discussion on Average MPG For Stock Duramax Trucks

Reduce the Duramax Engine’s Fuel Consumption

The average MPG for a truck with a Duramax engine varies depending on one’s size, year model, and the number of miles on the particular truck. Inexperienced drivers may see up to 10% less in MPG due to inexperience. Experienced drivers typically get closer to the maximum potential miles per gallon. As advertised by Dodge For example 1999 3500 with 149,000 miles is estimated from Dodge to get 11-gals/100mi vs 15.7-gals/100mi by an experienced driver.

We have chosen a couple of model years and types to research the average mpg for trucks with Duramax engines with these considerations in mind.

The following are 2001-2004 Dodge Ram 2500HD equipped with 6-speed manual transmission: 15 city, 20 highway (15.5 average mpg).

The following are 2001-2004 Dodge Ram 2500HD equipped with auto transmission: 17 city, 22 highway (17 average mpg).

A good rule of thumb that works well for our comparisons between diesel truck models is to take the horsepower rating and divide it by 10. For the comparison to standard gas engine trucks, we take the horsepower rating and divide it by 5. This will give us a figure to compare between engines of this size.

General Tips to Reduce the Duramax Engine’s Fuel Consumption

Here are some universal tips and tricks, if you follow them of course you can save your fuel economy and can save your money.

These are as follows:

  1. Drive your truck like a normal human being
  2. Avoid jackrabbit starts and stops and accelerate gradually to avoid jackrabbit starts
  3. Don’t have a heavy foot on the gas pedal
  4. Don’t race other vehicles (in fact, let them pass)
  5. Avoid fast acceleration from a standstill or slow down to avoid it
  6. Keep your tires properly inflated
  7. Make sure you aren’t carrying heavy loads in the bed of your truck
  8. Maintain and keep up on any preventative maintenance items that are due
  9. Buy a lighter load if possible, haul or tow less (or at least cut down if possible)
  10. Check your Duramax engine for any problems that can be the cause of high fuel consumption
  11. Update your Duramax diesel with newer parts to improve its fuel efficiency
  12. Make sure you are using the right amount of power in regards to your trip and load
  13. Learn how to drive a get a feel for when your diesel engine is working extra hard
  14. Don’t let your foot all the way off the accelerator pedal when you are slowing down
  15. Use cruise control to maintain a consistent speed (if it’s safe)
  16. Use the proper gear depending on how fast you want to go–overdrive helps in that regard if you have it

Final Words

It is possible to get better gas mileage out of your diesel truck if you modify the right components. This is not a simple modification and will require you to upgrade a lot of different parts of your engine to improve its fuel efficiency. If you do all of this work yourself, it is well worth it because the amount of money you will save on gas will more than makeup for all the time spent modifying your engine and other components.

Whatever you choose to do is completely up to you, but hopefully, these suggestions will help you out in the long run if your goal is getting better gas mileage out of your truck.

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