This has always been the case with diesel vehicles and gas vehicle for that matter.
I have a heavily modified pickup with a Duramax Diesel. When I bought it, it averaged 12.5MPG. After I got done “fixing” it, it averages 21.5MPG. Am I really polluting more now that I have removed a bed full of emissions stuff and use almost half the fuel to drive a mile?
According to the EPA, and numerous NGO “environmental” groups, your mods will kill thousands of people every year. Maybe millions.
While you are having fun in your truck, I hope you think about all the yellow speckled salamanders that you are murdering.
You monster!
If you don’t mind, what year is your truck? Did you do the ‘full delete’? I have a 2013. Once the warranty is out I plan on a full delete but if the increase is as good as you claim I might not wait that long...
I too have a modified PU with a Duramax with the Edge performance chip. Can adjust for economy, performance or towing. Also enlarged the intake and exhaust ports. The manufacturers want to make it illegal to modify their software under the Digital Millennium Copyright Act. Screw ‘em.
Same here with my 3/4 ton 06 cummins ..... turbo back exhaust, cold air intake, programers, compound turbos, injectors etc... my mpg improved by 6 mpg to 22 highway. ....
Albeit with different settings on the programer I can an do “roll coal” but normal economy settings no coal from the exhaust is visible ...... as well I lucky to live in a state that doesn’t do emission testing.
Im pushing 500 hp on my 5.9L cummins. I get around 21mpg too.
back tires wear out a lot faster tho’