2JZGTE , when you are done with the rental, please let me know how big hold Sixt put on your CC. I have very similar rental coming at MCO - 8 days, LCAR, rental price 238 USD.

Sixt T&C however states:

A deposit of up to three times the rental price is charged to the chosen means of payment as a security. The deposit for high-value vehicles may differ. The exact deposit is determined on collection since the amount is dependent on the vehicle.