EXTRA AIRPORT FEES NOT DiSCLOSED ON LINE. Rented an compact car on line. Arrived about 9 pm and the 'up selling' began after a longer then expected travel day. We were able to resist all offers except the 'bring it back empty' offer. Had expected to pay $275 for the car for a week but found a 'CFC' fee of $42, FMF fee of '$9.87' and a ERF fee of '$6.58' in addition to the near $100 of previously disclosed fees and taxes. SO now more than $50 extra dollar charge for the car. Another $28 for upgrade and no exorbitant gas charge. Turns out they didn't even have the compact car and were going to have to give us the upgrade but talked us into paying for it.