Update - I did hear back from Advantage - they refunded the extra day and the gas charge.  So my opinion has gone up - hopefully, they will be clearer on their extra charges, and do a little more customer service training.  I guess I would recommend Advantage to a friend - but with warnings!

I rented a car from Advantage at DFW for 4 days.  Their estimate was for $24 a day, with the notification of "Extra hour $15, extra day $99.99"  I returned it 3 hours late - to my surprise they charged me $99.99!  I called and they said anything over 59 minutes is an extra day.  I asked why they even...