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Returning the Rental Car with a Full Tank of Gas 

 Unless you like the convenience of the rental agency filling up the car when you return it, you may save a lot by doing it yourself somewhere close to the airport so your tank is full on return. (An exception to this is Hertz)

As you leave the airport, pay attention to the location of the closest gas stations for fillup when you return. You might even ask the rental agency where the closest gas station is located, or if you have a GPS-enabled phone where you can look it up before leaving your hotel for the airport and have it guide you to the station closest to the airport, if you just didn't see any when arriving.