Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
I'm not sure what AWD you're using to get that rate, but it should be easy enough for you to price the rental as a five-day, and see what kind of rate you get.
If you'd rather pick up and return the car at the airport, you can get a better rate with Budget, using Budget's "Wendie Special."