This is a great online tire calculator which will give you a rough comparrison between two tires. It gives you a decent way to look at different tire options rather quickly.

Miata.net Tire Size Calculator (http://www.miata.net/garage/tirecalc.html)

The stock tires for the Jeep Patriot are P205/70R16 **
The stock tires for the Patriot Limited 4x4 are P215/60R17 **
The stock tires for the FDII are 215/65R17 **

**based on the specs I am reading online

I knew I would find the other one...

I like this Tire Calculator (http://www.1010tires.com/TireSizeCalculator.asp) much better. You can compare several sizes at a time.