My Toyota dealer quoted a good interest rate on the 2010 II just ordered but can't write up the final paperwork locking in that rate until the VIN number is obtained. I'm concerned that rates may esculate in the up-to 8 weeks til my car arrives. When did your dealer fill out that final paperwork / purchase contract for your 2010 Prius? Before or when you took physical posession of your car?
There's another thread where this is being discussed: http://priuschat.com/forums/2010-toyota-prius/62325-dealers-what-does-mean.html