Usually the gas gauge on most vehicles read lower when turned off, and once they are started, the gauge will go UP.My chevrolet hhr does the same thing.
Many cars do this to discourage gas theft. If the car fuel gauge only shows 1/4 full, a potential thief may not bother to steal 2 or 3 gallons of gas. This is very normal.
If the gauge is stuck on full and you are sure the tank isn't full, you have a sensor sending wrong information to the dash gauge. Most cars now have a single fuel pump and sending unit that can be replaced by a mechanic.
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