Originally Posted by Zaphod

Using special rates, e.g. from FFP programs, is not really straightforward with Sixt. It took me ages to find out how to do it: On sixt.com, go to Car Rental / Corporate Login. Use the CD number (without "SX" in front) as the account number. The problem is the password - I've heard that Sixt uses "fly" for most airline programs. Might be worth a try, otherwise you could contact EBG and ask for the password.