The front page of MYFICO predicts that your % using your middle score is 10.4% in Texas. Many credit unions post rates on poor/fair/good/excellent but dont say what the ranges are.
You might also check with a dealer to see what credit tier you are in.
Credit Unions are a good place to start for a car loan but sometimes you can do better through the dealer. I would also eask you CU if they could give you an estimate on the APR based on your scores. They may not do it but it doesnt hurt to ask. As long as you dont apply that is.
1/25/2021: FICO 850 EQ 848 TU 847 EX