I've never used a rental car before. So you rent the car per day, are you charged extra per mileage and gas? I'm sure you pay gas extra, but what about the mileage? If I were to rent a car and drive 1000 miles to WDW, how much additional over the $$/day for the rental would I have to pay? My friend also told me you have to be 25 years old to rent a car or the rental places suck you with huge fees for their insurance. Unfortunately my 25th birthday is a day AFTER we will have already driven down to Disney. Currently we are planning on using my fiance's car to drive down, but a rental would be better to keep all those miles off her car. I just have no clue how rentals work or the requirements for them. Any help would be appreciated.