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The EGR and DPF systems used in diesel trucks cause (or caused, it’s been a while since I last looked it up) a big reduction in fuel mileage. I think it was a 2 or 3 MPG reduction.Doesn’t sound like much, but it adds up when you are running 200,000+ miles a year per truck. With the system running I believe the average fuel mileage for the trucks in our company is around 6 to 8 MPG depending on the route.
Additionally the systems are expensive as all get out to repair and maintain. When the DPF and DEF systems on my truck went out, the truck was down for 3 months waiting on parts, and from what I heard from our mechanic, the final repair bill was around $15,000USD.
That said, the fines for bypassing the emission systems are big enough that it’s really not worth it, but some owner operators don’t realize it as many don’t run their trucks like the businesses they are. They just know this is expensive as hell and they can reduce the cost by bypassing them.
I genuinely would like to know if the increase in CO2 emissions is worth the decrease in NOx emissions, but acid rain is a now problem and climate change isn't.
Don’t quote me on it, but I believe that the emissions tech is efficient enough that even with the increased fuel consumption there is an overall reduction in emissions across the board. That was my understanding when the tech was first being fazed in back in the mid to late ‘00’s. Whether that was true or just propaganda, don’t know. I just knew that full compliance was required to run in California and a few other states.
If it lowers MPG, it increases CO2 per work done. There's no getting around that.
I always thought that the way auto manufactures went about meeting emissions by adding more parts(that will break and need replacing, $$$) and lowering fuel economy(I wonder who benefits from that?) to be at best, lazy and at worse, suspicious. I recently learned about a Swedish engine manufacture called Scania that's managed to meet emissions without DEF. I'm definitely gonna keep an eye on that company.
For now, I'm just gonna keep making biodiesel for my farm and burning scrap wood for heat. The emissions tech they're piling on to diesels actually precludes running biodiesel in them, so it's not exactly like I'd ever be getting any new. Not like I'd want to buy a one ton piece of spyware anyway.