31-12-2021, 12:02 AM
(This post was last modified: 31-12-2021, 12:04 AM by Bob Culver.)
The CO2 is proportional to the C in the fuel so for normal mixtures is closely related to fuel consumption, so a 1928 Seven comparable with a smallish modern. With rich mixtures as at idle somewhat more than a low percent CO is produced but I dunno how this is assessed. Assessment at 40 mpg would seem conservative .