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A comment on GM accused of installing devices in diesel trucks to beat emissions tests. Parent comment

Re:GM accused of installing devices in diesel trucks to beat... by phkahler on Friday May 26, 2017 @09:13AM (#14423748)
I had forgotten about the NOx at higher temperatures. But running lean is also more efficient and can result in incomplete combustion:

https://en.wikipedia.org/wiki/Lean-burn

There really is a lot at play, but I stand by the statement that "clean" and "efficient" are directly at odds with each other.

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Re:GM accused of installing devices in diesel trucks to beat... by maxerickson on Friday May 26, 2017 @09:21AM (#14423790)
"directly at odds" is going too far.

For example, electronic fuel injection is cleaner and also much more efficient than using a carburetor.

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