[muny]

How are you calculating 4.5 lbs / 6 miles?

I think it's closer to 0.15 pound / mile, or 0.85 pound / 6 miles if you like.

Source: http://co2cars.apps.eea.europa.eu

[noughtme]

US cars are bigger. EPA 404g CO2/mile

https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-t...

[muny]

I also didn't realize I was looking at the numbers for a hybrid