I believe you ment to say 'equal emissions per gallon' not per mile. If they get equal emissions per mile then for a give number of miles they pollute exactly the same. CO2 is considered an emission, it is measured along with all of the other stuff.

One could argue that mileage *should* be considered a matter
pertaining to clean air, insofar as a car which gets equal emissions
per mile and better mpg will have better emissions, and insofar as CO2
(or for that matter H20) could be argued to be an emission.  But,
basically, the ZEV mandate as originally conceived doesn't really go
there, so far as I know.  Maybe I'm wrong.  Did they stray, in some of
their revisions?




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