Click on "Tools" at the top of the page, then click on "Aerodynamic & rolling resistance, power & fuel consumption calculator". Here is a direct link:
Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com
For the Tercel, I used 2200 lbs (2000 lb curb weight + person and stuff) and .010 Crr since thats probably closer to reality. Cd is .32 for the car and I got the frontal area from the wiki page on CdA (also a link on the top of the page). Everything else I left as is.