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I'll be happy to say this again, I don't know very much about diesels. My argument was never against diesels because I don't have any proof that diesel emissions controls affect MPG.
They do in gasoline engines. 7 MPG for me. . .
I understand you cannot regulate the number of grams per gallon because cars have different specifications that make that impossible. By the idea of grams per gallon the scooters can still escape virtually with no emissions controls.
That said every car converts fuel to heat and emissions of some sort.
Emissions controls reduce that to acceptable levels.
High MPG vehicles have less total emissions to weed out than teen MPGers because they have greater MPG, therefore less fuel consumed per distance traveled, therefore less emissions total created, therefore less emissions to weed out to slip in under the standards.
For diesels there might not be a case, because diesel controls might not cost you any MPG. I don't drive one and haven't had the opportunity to rip it out and try it.
In gasoline it does.
I ripped it out, I see an MPG gain.
Because it costs more energy to make gasoline than burn it it saves the world energy(fuel) to increase how much of that power makes it to the pavement. Energy is such a "dirty" market that saving it from my car makes tremendous strides. My car doesn't produce any measureable NOx SOx or a handful of pollutants generated by refining gas and so its obviously the best choice to limit how much fuel I use at the cost of dropping some hydrocarbons in the air.
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