According to the product information manual that a dealership gave me about a month ago, it states that the fuel capacity on both the sedan and hatchback is 12.4 gallons. It doesn't mention anything about a reserve tank though. The other interesting tidbit is that the heaviest version of the 2012 is actually the Titanium 4-door @3025 lbs. (base curb weight, approx.), whereas the Titanium 5-door comes in 29 lbs. lighter @2986 lbs. Obviously, these weights vary based on packages/options. Also, the 5-door is about 6" shorter than the sedan.
2012 S. G. Metallic Titanium Hatch - Born on 5/10/11
Options / Customizations: