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Sounds like a slushbox geared for good highway mileage at the expense of city mileage. My Buick is the same way. First and second are stump-pullers, 3rd is a compromise where it can have the TCC locked, and 4th is highway where the TCC stays locked most of the time.
Check for converter lockup by an RPM drop when you're feathering the throttle in 3rd gear. It doesn't happen immediately, and it'll be dropped quickly when accelerating more than very gently. It may also have been disabled to make for a "peppier" drive around town.
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2012 Chevrolet Cruze Eco 6MT
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