CHEVROLET 2009 Malibu - Manual (Page 269)

To open the fuel door, push the rearward center edge in
and release and it will open.
To remove the tethered fuel cap, turn it slowly
counterclockwise. If the vehicle has E85 fuel capability,
the fuel cap will be yellow and state that E85 or gasoline
can be used. See Fuel E85 (85% Ethanol) on page 5-8.
5-11