Chevrolet Aveo 2007 Owner's Manual page 270

Hatchback shown. Sedan similar
The tethered fuel cap is located behind a hinged
fuel door on the passenger's side of the vehicle.
270
To remove the fuel cap, turn it slowly
counterclockwise. The fuel cap has a spring
in it; if the cap is released too soon, it will spring
back to the right.
CAUTION:
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Fuel can spray out on you if you open the
fuel cap too quickly. If you spill fuel and
then something ignites it, you could be
badly burned. This spray can happen if
your tank is nearly full, and is more likely
in hot weather. Open the fuel cap slowly
and wait for any hiss noise to stop. Then
unscrew the cap all the way.