I am wondering if there have been studies or calculations of the NOx emissions per mile of high MPG lean-burn gas-powered cars versus standard gas-powered cars.
Honda made some great lean-burn cars in the early to mid nineties. But the lean-burn era was short lived because the emissions were claimed to be higher.
However I am not convinced that the NOx emissions per mile is higher. I am wondering what comparisons have been made if any.
CO2 emissions per mile is available but I have not found NOx per mile.
My understanding is that concern about NOx emissions is the main reason lean-burn tech was not used more often.
Here is the link to one of the cars I am referring to. The gov site does not show NOx per mile, only GHG per mile and CO2 per mile.