I've noticed it does improve my mileage by a fair amount. In ECO mode, I've gotten up to 34.6 mpg on the highway, and my in-city mileage has never dipped below 17 mpg (I hit a lot of stop and go traffic on my commute to and from work PLUS I live in Houston, a huge city renowned for it's stellar lack of decent public transportation.
To ECO or not to ECO?
Do any Terrain owners out there actually notice a difference in fuel mileage when operating the vehicle in ECO mode? I've had my Terrain for about a month and haven't noticed any improvement.
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