Why would this car use so much gas, what mechanically on 2008 Hyundai Azera

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Problem occurs all the time just uses too much gas!
(1) Answer
There are many reasons a vehicle can use too much fuel. Some are mechanical and engine management issues, some are physical attributes.

I would recommend a diagnostic assessment be carried on on the drivability side - including the engine performance.

At the same time - check for any attributes that may be slowing down your vehicle, requiring more fuel to operate your car, etc. Things like bug deflectors, exterior trim.