gas tank capacity 07 hatch S

My book says 13.2 gallons and something about a 2 gallon reserve.
does that mean 15.2 gallons? When i have 2 or 3 bars still lit on gas guage it takes over 12 gallons. When full the computer says a cruise range of 500+ miles.that would be about 33MPG which is about right for city driving.
 
                                                                        John