[mwebb]

some of the newer VW DSG transaxles are designed to
"freewheel" or coast
downhill
more in the systems designed for fuel economy

the 09g 6 speed automatic is not

and
the DSG is really a computer controlled (and shifted) manual transmission
no torque converter or LOSSES from a torque converter
so IF you are going or thinking to stick with VW ( a choice which i agree with)
try to find a manual trans or DSG and avoid the automatic altogether

i find i can hold most of the 1.8s or the 1.4 near 50mpg while at cruise around 55 to 60mph with DSG or manual trans as per the mfi display

an UNmentioned choice C is purchase and older TDi with the BEW or BRM pd engine i would never consider a diesel cruze they are junk in my very biased but knowledgeable opinion

having said this
be aware that i am a certified VW tech and have been for many moons

i drive a TDi golf with BEW pd engine , manual trans AND a V6 ATQ passat auto trans