Use it whenever you want to save fuel, which at today’s prices should be all the time.
Active Eco, engaged by a dashboard switch to the left of the steering wheel, modifies engine operation so you get more gradual acceleration, and the transmission tends to shift to higher gears sooner and isn’t as quick to downshift for passing. Active Eco also cuts off the fuel supply during deceleration, and Hyundai says all this electronic management can increase fuel economy as much as 7 percent.
This system restricts engine and transmission performance in favor of fuel economy, so in Active Eco mode your Sonata may feel less responsive accelerating up a hill or when trying to pass cars on the highway. You can turn it off if you’d rather burn rubber instead of saving fuel. Active Eco is standard on the Sonata SE and Limited and included with the optional automatic transmission on the GLS.
The Sonata also has a green Eco indicator light in the gauge cluster that illuminates and acts as a pat on the back when the car is being driven efficiently, meaning that you are using a light throttle foot on your own and without the help of the Active Eco system.
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