Blue book on the truck is $2,500 but without A/C or working windows there is NO way we could sell it for that here in Texas. We would be lucky if some poor schmuck would pay $1.5k for it. We bought it last June and have kept up with insurance and registration the whole time.
The articles I am finding say that if the new vehicle gets at least 10 mpg better then you qualify for the full $4.5k