What does the ECO button do in a Vauxhall Combo Life?

I noticed a button with the letters 'ECO' on it while driving my Vauxhall Combo Life. Can anyone tell me what this button does and if it's worth using?

The ECO button on the Vauxhall Combo Life activates the ECO mode which optimizes fuel consumption and reduces emissions. It's recommended to use this mode for everyday driving.

As a Vauxhall mechanic, I highly advise using the ECO mode. It can save you money on fuel and is better for the environment. It's a win-win.

I've been driving a Vauxhall Combo Life for years and I never use the ECO button. It doesn't make much of a difference in my opinion.