[stuart5936]

Please explain how the ECO works on the way my Sonata drives. Is it just a light that comes on, or does it actually adjust, mechanically the way the car gets better mileage. If it does adjust mechanically, do I give up anything the way the car drives. Thank you

 

[riceR]

Please explain how the ECO works on the way my Sonata drives. Is it just a light that comes on, or does it actually adjust, mechanically the way the car gets better mileage. If it does adjust mechanically, do I give up anything the way the car drives. Thank you

"The ECO indicator light helps that you to drive economically. It is displayed if you drive fuel efficiently to help you improve fuel efficiency."
Manual pg 4-55

Nothing more than a light that tells you that you're driving habit is good on gas.

 

[turbogiotto]

In fact in my 2.0t the ECO use a different mapping of your car (multiple ECU ) .It use a different timing, fuel to air ratio and even makes your A/C use less energy. The transmission shift at different rpm.