Why is my car using more gas than average?

I drive a 2007 honda accord coupe.

It needs a tune up

Air conditioning

No details, so how are we supposed to know? Here is a list of things that contribute to poor mileage:

Bad driving habits, particularly fast "jack rabbit" acceleration.
Many short trips that don't allow the engine to warm up to normal temp.
Start /stop city or suburb driving, or driving in heavy traffic.
Tires under-inflated.
One or more brakes dragging.
Using the cheapest gasoline or fuel that has a high concentration of ethanol
Dirty air, oil and fuel filters.
Dirty throttle body or worn fuel injectors.
Engine needs a general tune up (plugs, wires, distributor cap etc)
Fuel system leaks or faulty gas cap.
Other faulty parts including O2 sensor, EGR valve or MAF sensor.

Obviously you are incapable of diagnosing any of the above problems except your driving environment, driving habits, tire pressure and the fuel you use. For the other things, have a professional mechanic check it out.

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