Can anyone enlighten me whether the green Eco light of Elantra in Malaysia
1) just to show whether we drive fuel efficient or not
OR
2) control the engine throttle to make it more fuel efficient

As I understood from this video
http://www.youtube.com/watch?v=1T98fI3nUZE

a) the Ecomode which control engine throttle should be green Eco light come with Eco button (2012 model).
b) the Ecomode with only green Eco light only show our driving behaviour (2011 model), which seems like the case with the 1st batch Elantra in Malaysia.

My SA only told me the Eco light automatically goes OFF when we sped and ON when we slow down. For me it seems like only showing driving behavior, and not doing engine throttle control for fuel saving.