When in eco mode, vehicles like the Optima change to different shift points in regard to the automatic transmission. With different shift points, the transmission and engine are more efficient, which saves gas. Moreover, the engine doesn’t use as much power. While the trade-off is more sluggish acceleration, you’ll reap the benefits of improved fuel economy.
You can also use eco mode in any situation, but it’s typically meant for driving in the city. Driving with eco mode on the highway won’t hurt anything. But since you’re at a constant speed, eco mode won’t improve your mileage on the highway.
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