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Sounds like it's time to get serious. Two areas - the driver (known here as the nut holding the steering wheel) and the vehicle.
VEHICLE
Check for something dragging. You should be able to push it by hand on a level smooth surface. If not, check everything that rotates, especially brakes. You have three separate brake systems - front wheels, rear wheels, and parking brake (connected to the rear wheels). Tire pressure is a biggie.
Check the engine from one end to the other. Timing chain, exhaust restriction, loose things that should be tight.
Transmission - manual or automatic? If automatic, is the torque converter working correctly and is it shifting correctly?
DRIVER
Are you timing traffic lights? Minimizing idling? Practicing what we call DWB - Driving Without Brakes? Studied the Master List of 65+ Mods in Ecomodding Central? Driving techniques can improve mileage by as much as 100%.
Good luck and keep trying.
Jim
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