*Loan,banking and credit>>>auto loan

Does it make sense to refinance my auto loan from 12.55% to 8.55%. the original loan is 6 months old.?

yes, you save 400 dollars a year for every 10,000 owed.

of course it does. You'll save money.
Are you sure you can't get better than 8.55%. While much lower than 12.55%, 8.55% seems very high. If 8.55% is the best you can get, then I would also shorten the loan period (by one year) since you will be paying much less. The sooner you can get out of any debt the better.
First, however, I'd really shop around.
It really depends on how much the fees are to refinance, the term of both loans, and how much you owe on the car. Since you have only had the car for 6 months, you probably owe enough to make it worth while. I've given a link for a loan calculator so that you can put in your exact numbers and see what the difference is. In general, if you owe more than $5,000, it will definitely be worth it.
http://www.bankrate.com/brm/auto-loan-ca...
Why not?