I've come close several times. Best I've seen is 39.5 on the SG doing about 60-65 over ~145 miles. I did see a 38 mpg tank over 600 miles driving up I-95 earlier this summer.
~62 mph seems to be the car's sweet spot for 4th. It can climb hills just fine then.
In-town, get to 30 mph and back off, let the torque converter lock up in 3rd.
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2012 Chevrolet Cruze Eco 6MT
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