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I used the USAA car buying service certificate and applied online for an new car auto loan on 4/24/18. I was instantly approved for $50k at 3.84% up to 72 months and a .50 discount to 3.34% for using the buying service. They pulled my Experian 770, but I'm unsure of which scoring version/model. Their top advertised rate is 3.29% with above discount to 2.79%.
The car buying service is just ok. It's basically an aggreement with USAA/TrueCar.com and dealerships, but they all share in profits for driving customers to the service.
I used every incentive eligible & available through buying service to the angst of the dealer sales manager.
I contested the rate with USAA to see if I could get to 3.29% with no luck and of course they won't disclose what's required to get that rate. I even escalated my request and spoke with a manager/supervisor.