Fiat is the lowest CO2 manufacturer of cars in Europe.

The predominantly small car maker leads for the second year running.

The average CO2 emissions of Fiat cars are 133.7g/km. Down from 137.3g/km.

Peugeot was second, followed by Citroen, Renault and Toyota.

BMW achieved the greatest overall reduction of 16g/km on a year on year basis.

The report was compiled by the consultancy division of JATO Dynamics, a world leader in automotive data provision.

“Introduction of ever tightening safety legislation, and the demand for customer convenience and comfort features is increasing the weight and mass of vehicle structures,” commented David Di Girolamo, head of JATO Consult.

“Against the odds, manufacturers are producing heavier, safer cars while still improving their environmental credentials.”

Top 10 best-sellers ranked by CO2 emissions

1 Fiat 133.7g/km

2 Peugeot 138.1g/km

3 Citroen 142.4g/km

4 Renault 142.7g/km

5 Toyota 144.9g/km

6 Ford 147.8g/km

7 Vauxhall 151.1g/km

8 Volkswagen 158.8g/km

9 BMW 160.6g/km

10 Mercedes 185.0g/km

Source JATO Consult
Fiat is lowest for CO2 says JATO report