I have a '06 Aveo5 hatchback auto with 20k miles on it, currently getting about 29 mpg (after servicing). about 50% highway 50% city. Of course this is in sunny Singapore. I usually only throttle 2-2.5k rpm and light on pedal, not maintain throttle. I also use my aircon halftime.
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tmot (Black '06 Aveo5 HB AT)