depends on credit, year of car, value, etc
my brother bought an 05 scion XA in november, he has 0 credit, dealership gave him 24% interest through toyota financial. when i heard about it, i about slapped my mom for letting him sign for that (315/mo for 72 months, on a sub 12k car with tax/title/tags). we went to my bank and i signed with him on the loan and got it down to like 8.5% for 66 months (232/mo for 66 months...a 6 month shorter loan and 85$/mo less!)
when i was searching around may when my old car got totalled, my bank gave me rates for the years they would finance...the older the car i was looking at, the higher the rate was, and the shorter the term
ie -
2002 - 10.4%, 48mo
2003 - 9.9%, 48 mo
2004 - 9.4%, 54 mo
2005 - 8.9%, 60 mo
2006 - 8.4%, 60 mo
2007 - 7.9%, 66 mo
2008+ - 7.4%, 72 mo
just examples