I too have wondered this as well ( If a Tier II car that gets 45-50 MPG produces the same amount of emissions overall as a SU-LEV car that gets 25-30 MPG ).
It seems like it would balance out, but then I begin to think of how mopeds for example have horrible emissions despite giving great MPG.
I wouldn't be surprised to find out that our old Civics are real pollution monsters.
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