A/C ECO mode
 

I was told that this applies only to Japaneese models:
Next to the air-condition light, there's an ECO light. Very rarely I've notice that it was on but I haven't managed to understand the conditions under which it's on. Is there a way to manually enable economy mode for a/c?

I only manual A/C i know is to wind down the windows when i drive :P Which is pretty much everytime i drive my 7