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Eco button decreases air conditioning output to aid fuel economy, if the driver is willing to sacrifice a bit of comfort to sip less gasoline. added by krise: I haven't noticed the above but I have no working A/C anymore - i have noticed that when Eco mode is enabled, the car (automatic tranny) shifts up to higher gears earlier and you have to give it more gas in order to get it to downshift therefore if driving up a lot of hills, keep eco mode OFF.

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โˆ™ 2006-10-18 18:51:57
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Q: What does an ECO button do on a 1990 Hyundai Excel?
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