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If you pay off your vehicle early is it really a 20% loan?
I believe that your personal track record of on time payments means far more to banks than other banks interests rates do. I'm sure others will post with more efficiant information for you.
Good Luck!
The auto loan just shows up on your credit report payment history - the "terms" as far as interest rate does not (starting balance, payments, current balance does). Having a 2 year on time payment history on an "installment type" account is a net positive factor - the auto loan on time factor will help your credit report. That being said, if I were you I would refinance the auto loan and get out of that blood-sucking 20% interest rate as soon as possible.