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...FWIW, we have a 2011 Cruze LTZ 1.4LT A6, not an Eco with M6, but can answer a few questions. First, only the M6 models seem to be beating their EPA highway MPG estimates (and rather easily); most of the A6 models (Eco and non-Eco) seem to struggle just to barely achieve their EPA highway MPG estimates.
...also, there's a LOT of customer complaint about how the A6 (GM Hydra-Matic 6T40) transmission "shifts'--sometimes abruptly, other times sluggishly (I think the problem is how GM software backoffs turbo power during up- and down-shifts).
...best milage with A6 seems to be at 55-60 mph, anything faster and MPG drops off quickly (both Eco and non-Eco have exactly same A6 gear ratios).
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