Other Car Rental Programs/Partners (ie. Alamo, Enterprise, Sixt) - Eurpocar in the US

Hello all,
I have been renting cars with Europcar for almost 3 years now ina regular basis in Europe. When I try to rent a car with Europcar in the USA (MIA), in the voucher shows "go to the National counter".
What I found to be very weird is that if I compare the fares for the same cars, Europcar is cheaper than National and it does not have any under-age fee. Has anyone already rented by Europcar in the US?
When I select to book with my HSBC Premier Card prepaid the price of Europcar goes down for less than half of National`s.

Thanks in advance for your help.

Luiz

National and Europcar are very closely linked. I recommend keeping a copy of your reservation that shows $0 underage fee on it. Other than that, you should be good to go.