You are not alone in your frustration!
The "average" owner only gets 15-16 MPG with their $70K diesel pickup!
"Tier Emission Standards" have forced diesel truck manufacturers to DE-TUNE your engine below 2200 RPM.
It may sound crazy but much of your stock diesel's poor mileage is caused by this De-Tuning, not the emission equipment on your truck.
The best solution to improve your fuel mileage and overall performance is to "RESTORE" the low end horsepower that was stolen for the sake of [emission standards] And that is exactly what our Plug-N-Go diesel performance modules do.
For more detailed info. Please tell us which diesel engine you drive?