Green car study from the UK
 

https://www.whatcar.com/news-article.aspx?NA=228254

smart #1 (with an out-of-production model) and #2 (with the car I have)...Prius at #12.

Hmmm.....

Mike T -

Woo hoo! The Fiat Panda is on the list :

Greenest cars
1 Smart Roadster
2 Smart Fortwo cabriolet
3 Citroen C1 1.0i
4 Peugeot 107 1.0
5 Citroen C1 1.4 HDi
6 Fiat Panda 1.2
7 Ford Ka 1.3
8 Toyota Yaris 1.0
9 Fiat Panda 100hp
10 Peugeot 206 1.4
11 Mini Cooper D
12 Toyota Prius 1.5
Source: Cardiff University/Clifford Thames

CarloSW2

background info on methodology: https://ct.colewood.net/ervpaper.pdf

results links plus interactive tool: https://ct.colewood.net/