I need to fill up a rental before I return it it Avis at the Tampa Airport what exit should I use to get the gas?

Pull over and check Google to help find nearest stations.

I drive from Clearwater fyi Tampa over a long causeway. There was a gas Station just after getting of the causeway. Near the ap

G P S or Google , Nearest Gas Station near Tampa Airport exit?

I filled up on I-4 and drove in from there I wind up saving money that way gas is much more expensive at the airport.

Your GPS should be able to tell you a gas station closest to Tampa airport. That's what i used in April.

yes, you have to return your tank full of gasoline so if you do not get charged for not filling it