6.7 Cummins MPG with DPF Delete: What to Expect

Renowned for its power, longevity and heavy-duty performance the 6.7 Cummins diesel engine Located in Ram 2500 and 3500 trucks it’s a popular choice for people who tow, carry or simply appreciate the raw torque of a diesel. Among the most hotly debated (and contentious) issues in the Cummins community is how removing emissions components especially the DPF (diesel particulate filter) affects fuel economy. Given a DPF delete 6.7 Cummins what sort of MPG could you anticipate? Let’s examine more closely.

What Is a DPF Delete?

A part of contemporary diesel engines meant to catch soot and ash from the exhaust therefore lowering air pollution the diesel particulate filter (DPF) Although it is quite vital for the environment the DPF can eventually lower fuel economy and limit exhaust flow particularly if it gets blocked.

Removing the filter and reprogramming the engine’s computer to run without it constitutes a DPF delete. This is usually combined with other changes such as:

• EGR delete: Removes or disables the exhaust gas recirculation system.
  
• Tuning: Reprograms the engine control unit (ECU) for performance and to avoid error codes.
  
• Full delete kit: Often marketed as a 6.7 Cummins delete EGR DPF delete kit, which includes all components needed for the modification.
  

MPG Before and After DPF Delete

Stock 6.7 Cummins trucks typically get around:

• 13–16 MPG city
  
• 17–20 MPG highway
  

After a DPF delete, many owners report significant improvements in fuel efficiency:

• City MPG: Increases to 15–18 MPG
  
• Highway MPG: Can reach 20–24 MPG or higher
  

That’s a potential gain of 2–4 MPG, depending on your driving habits, terrain, load, and additional mods. Some truck owners using full 6.7 Cummins delete EGR DPF delete kits along with performance tuning even claim gains of up to 5 MPG or more under ideal conditions.

Why Does MPG Improve After a Delete?

Several factors contribute to improved mileage after a DPF delete on a 6.7 Cummins:

1. Reduced Backpressure: With the DPF and EGR systems removed, exhaust gases flow more freely, allowing the engine to breathe better.
   
2. Lower Regeneration Cycles: Stock trucks with DPF systems perform “regen” cycles to burn off soot. These cycles burn extra fuel and lower overall MPG.
   
3. Improved Tuning: Custom tunes included with delete kits optimize fuel injection timing and turbo boost, improving combustion efficiency.
   
4. Cooler Engine Temps: The engine often runs cooler without EGR gases being recirculated, which can contribute to better performance and mileage.

Is It Worth It?

From a pure performance and MPG perspective, many truck owners believe it is. In addition to improved fuel economy, a DPF delete can offer:

• More horsepower and torque
  
• Smoother throttle response
  
• Longer turbo and engine life (less stress from regen heat)
  
• Fewer maintenance issues related to sensors and filters
  

However, there are downsides and risks:

• Legality: In most places, driving a deleted truck on public roads is illegal and may lead to fines or failed emissions inspections.
  
• Warranty Issues: Most manufacturers will void your powertrain warranty if they detect a DPF or EGR delete.
  
• Resale Value: A deleted truck may be harder to sell or trade in, especially at a dealership.

What’s Included in a 6.7 Cummins Delete EGR DPF Delete Kit?

If you’re considering going this route (off-road use only or where legal), a complete delete kit typically includes:

• DPF delete pipe (replaces the section with the DPF)
  
• EGR delete kit (removes or blocks off the EGR valve and cooler)
  
• Tuner/programmer (to reprogram the ECU)
  
• Optional upgrades: Cold air intake, high-flow exhaust, performance injectors
  

Make sure you get a kit that is compatible with your specific truck model and year.

Final Thoughts

Removing the DPF on a 6.7 Cummins can lead to clear improvements in MPG performance and dependabilitybut it raises major legal and environmental issues. Although many drivers say full 6.7 Cummins delete EGR DPF delete kit increases of 2-5 MPG or more, it is crucial to consider the advantages against the hazards particularly in relation to emissions laws and warranty issues.

A DPF delete might provide the performance edge you seek if your truck is being used for off-road, racing, or agricultural use (where such changes might be allowed). For those not in the legal system, the wiser course could be to stay within the law and investigate other MPG-boosting improvements.