The Co2 emissions are based on the emissions during the European drive cycle. Co2 is pretty much directly related to fuel consumption on this test
Unfortunately perfect combustion never happens so you don't get only water and co2, if it did there would be no need for catalytic convertors. The purpose of catalytic convertors is to convert these nasty emissions into Co2, the more efficient the cat the more co2 is produced.
Then there are lean nox traps that are designed to reduce Nox emissions.
Unfortunately perfect combustion never happens so you don't get only water and co2, if it did there would be no need for catalytic convertors. The purpose of catalytic convertors is to convert these nasty emissions into Co2, the more efficient the cat the more co2 is produced.
Then there are lean nox traps that are designed to reduce Nox emissions.