For those of you using TFS financing 1) what % did you get & for how long AND 2) when were you able to lock in that interest rate? Any time before taking physical posession of the car? My dealer quoted a perfered rate of 4.49% last Friday but they need a VIN number before writing up the final contract; I'm worried that interest rates may esculate in the up to 8 weeks while awaiting delivery of my 2010 Prius. When is a dealer privy to the VIN #?