Well, I DO agree with the 'if you can't tell the difference' bit, but without SOLID, REAL PROOF to the contrary, I FIRMLY believe that the net benefit of DEF (and likely DPF as well) is negative when you consider EVERYTHING. Yeah, the effect is 'lower emissions' out of the exhaust of the trucks on the road equipped with this stuff... BUT... WHAT ABOUT EVERYTHING REQUIRED TO GET THERE? With DEF, it's a whole new industry, with manufacturing costs, both financial and environmental, then you have transport costs, financial and environmental, then you have the environmental disposal costs of all of the plastic jugs, and most likely other environmental costs that I'm not even thinking of.... And then they cite LA and/or San Fran with regards to smog, but there are reports from LONG ago, WAY before anyone was really out there, let alone internal combustion engines, of what was described as smog... So when it comes to LA & San Fran and smog related to ICE vehicles (which CA uses to try to drive all 'emissions requirements'), I have to call at least 50% BS. That's not the whole picture. But all to reduce something that plants can and do absorb to make their food... At the end of the day, I can't see how it's a net positive if you take EVERYTHING into consideration. I do honestly feel that when you look at EVERYTHING, the current emissions equipment is actually doing more harm than good.
