The Fiat group has topped a chart showing car brands that have emerged closest to Europe Union's fuel-efficiency goals.

"All of Europe’s top twenty brands improved their emissions in 2010 compared to 2009, with Fiat yet again recording the lowest average emissions down 4.7 g/km to 123.1 g/km," auto information group JATO said in a report released on Monday.

The overall target for all new cars in Europe, as defined by EU regulation, is 130g/km for 2015. The regulation provides a calculation defining an individual target for each manufacturer group in proportion to the average kerb weight of its cars.

"Fiat Group recorded the lowest average emissions of 125.9 g/km, while Toyota is the closest group to meeting its target based on the analysis of 2010," the report said.

Following are the top ten most economical car manufacturers in Europe.

Rank by Average CO2 (g/km) - 1

Average CO2 (g/km) in 2010 - 125. 9

Targeted CO2 (g/km) in 2015 - 116.1

Rank by Average CO2 (g/km) - 2

Average CO2 (g/km) in 2010 - 130.00

Targeted CO2 (g/km) in 2015 - 124.8

Rank by Average CO2 (g/km) - 3

Average CO2 (g/km) in 2010 - 131.6

Targeted CO2 (g/km) in 2015 - 125.2

Rank by Average CO2 (g/km) - 4

Average CO2 (g/km) in 2010 - 136.3

Targeted CO2 (g/km) in 2015 - 123.4

Rank by Average CO2 (g/km) - 5

Average CO2 (g/km) in 2010 - 136.9

Targeted CO2 (g/km) in 2015 - 125.3

Rank by Average CO2 (g/km) - 6

Average CO2 (g/km) in 2010 - 137.3

Targeted CO2 (g/km) in 2015 - 117.5

Rank by Average CO2 (g/km) - 7

Average CO2 (g/km) in 2010 - 138.6

Targeted CO2 (g/km) in 2015 - 125.4

Rank by Average CO2 (g/km) - 8

Average CO2 (g/km) in 2010 - 139.8

Targeted CO2 (g/km) in 2015 - 127.5

Rank by Average CO2 (g/km) - 9

Average CO2 (g/km) in 2010 - 142. 5

Targeted CO2 (g/km) in 2015 - 139.8

Rank by Average CO2 (g/km) - 10

Average CO2 (g/km) in 2010 - 147.13

Targeted CO2 (g/km) in 2015 - 127.7