http://www.carbuyingtips.com

Chapter 4
http://www.carbuyingtips.com/car4.htm

Fill out the spreadsheet:
http://www.carbuyingtips.com/offer.xls

If you don't have MS Office or MS Excell, free Office compatabile suite:
http://www.openoffice.org

Crunch the numbers and then you will know if it's a good deal or not.

Don't forget to factor in your trade or financing either - it's a package deal!

Good luck!