How does the eco mode in Ford Fiesta affect the fuel economy?

I have recently purchased a Ford Fiesta and I noticed an eco mode button on the dashboard. How exactly does this eco mode affect the fuel economy of the car? Should I always have it on or only use it in certain situations?

Eco mode adjusts the engine and transmission settings to optimize fuel efficiency. It's recommended to use it in city driving or during long trips to save on gas. However, it may affect the car's performance.

I would recommend keeping eco mode off if you are looking for a more responsive driving experience. It's great for saving gas, but it can feel sluggish in certain situations.

I personally only use eco mode on long highway trips to get the best gas mileage. But in city driving, I turn it off to have more power when I need it.