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So lets say that you warm up the car for an average of 3-5minutes to drive it 2 miles. Now if the maximum speed you attain is usually 30MPH, that should be under 1k on your tach. Your cold idle speed is about 1500rpm's. So you are probably using 3x the gas warming up the car as you are driving the car.. =o)
The only thing that "might" be saving your mileage is the 12 mile trip to the mall on the weekends.
I put about 800 miles/month on my vehicles as everyday drivers and normally get the city rating even though I take some longer trips...
I would try and take it on a road trip one day... at least 50mi ea way.. then fill up the tank.. see where you are at... preferably highway miles.