Does anyone have any data on the Carbon Footprint created by the actual production of a new car with all of?

Question

the emission gizmos against running an older, say 20 yr old, car?

Answer 1

No.
Almost impossible to work out - given the number of different suppliers, suppliers to suppliers, etc. involved in the production of a car.

The total carbon emissions of a new car may not be much less than an older one.
However, the emissions of legislated pollutants (carbon monoxide, hydrocarbons, particulate matter, nitrous oxides) will be much higher in an older car than a newer one.

When considering replacing an old car with a new one for environmental reasons you have to take more than just total carbon into account, and make an informed trade-off between carbon dioxide and other pollutants.

Answer 2

Too hard to figure. But a plug-in electric car with a steam powered on-board generator would produce much less pollution and have great mileage. It would run as an EV for 80-90% of the time and use fuel only 10-20% of the time.