2008 Aveo 5 door, 51K miles, manual transmission, summer time 10 miles across town @30 MPH~34-35.
Interstate going 65 MPH ~39 MPG.
Winter time when it is -20f the in town mileage drops to 25MPG. I don't idle/warm up the engine for more than 60 seconds.
The MPG improves if I plug in the engine heater.