I am sorry, but this is really too much incorrect information here from the representatives.

1. there is no 550i in LDAR in Germany: incorrect, Sixt has 550i GT xdrive, and not only 1 or 2

2. there is a oneway fee of 15€: incorrect, firstly the fee would be 18€ at airports and secondly, it doesnt exist anymore since november 2011

3. Sixt Diamond receive a double upgrade subject to availability: incorrect, Sixt Diamond receive a guaranteed one class upgrade

I think, everyone really appreciates your work and you are helping many of your clients, but the information you are getting from Germany is somehow incorrect.