Restating what the others stated, the best rate yields a score of 700 or over. 600s will also get you a good score. However, of your score is between 600 and 700, i recommend you get pre qualified with your credit union or USAA, experience has taught me that dealers cannot match the credit union rates. Best rates and terms are with your cu.
High 600s will get you a pretty good interest rate
Not if you have a good credit score.
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