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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.
It's almost like we should've stuck with electric trains for long haul freight and left OTR hauling for last-mile. Almost like that would've seriously helped the CAA rather than a bunch of half-fixed like this.
I think it's worth noting that this is an environmental benefit, not only an economic one. In other words, it's not that people defeating the emissions control devices are making their trucks purely worse for the environment for their own selfish benefit; it's that they're making a trade off between increased 'regular' (for lack of a better term) pollutant emissions like NO~x~/SO~x~/particulates, and decreased greenhouse gas emissions (CO~2~).
I'm not saying they're altruistic -- obviously they do it to save money (at least until they get caught and fined) -- but I am saying that we can't just assume it's bad without first doing the math and making a value judgement about what sorts of emissions we care about.
Geeking out about an edge case where not having the fancy emissions controls is better: using biodiesel
There are also more complicated considerations, such as how getting rid of these emissions controls and retuning the engine may also allow it to run on higher percentages of biodiesel. The trade-offs associated with that are not only the fact that the fuel becomes carbon-neutral (net CO~2~ emissions go to zero, at least for the percentage of the fuel that is bio- instead of dino-), but also that biodiesel naturally has zero sulfur in it (which means zero SO~x~) and burns cleaner (fewer particulates) and hotter (more NO~x~) than dino-diesel. On top of that, more NO~x~ could be a bad thing or a good thing, depending on whether you're driving in a NO~x~-limited or VOC-limited regime.
In other words, using 100% biodiesel in an urban environment (VOC-limited) is IMO enough to actually justify preferring not to have the fancy emissions controls for legit environmentalist reasons: the better efficiency in general (as the parent comment mentioned), zero net greenhouse gas emissions, zero SO~x~, irrelevant NO~x~, and all at the cost of only moderate particulates (more than would be emitted from a vehicle with a DPF, but less than would be emitted if the same car were burning dino-diesel).
Of course, none of those benefits occur unless you actually seek out B100 (or at least, significantly higher percentages than the B5 that normal diesel can be blended up to), and that's a motivation much more associated with the hippie types that drive VW TDIs and old Mercs, not truckers.
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.
Climate change is absolutely a now problem, it's affecting far more people right now than acid rain ever has or ever will, it's costing trillions and you're already paying for it in taxes, insurance, and other ways. The fact that people don't understand it or appreciate how significant it is doesn't mean it's not a "now" problem, it just means it's not a problem that's ever going to get fixed because people like you don't and won't ever consider it a "now" problem. Enjoy the challenge of struggling your way through the increasingly impossible economy, it's not going to get better.
You're preaching to the choir. I referring to the mindsets of the law makers who wrote those laws.
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.