It's extremely variable based on your age, marital status, what car you drive, driving record, etc. The only way to find out is call around and ask. Time consuming, but worth the trouble. I ended up getting a special deal through Travelers this way as I have a clean record and am insuring multiple vehicles. One word of advice: stay way the hell away from State Farm. I dropped them because they were totally incompetent when it came to dealing with simple stuff, like adding my wife to the policy. They are also your best friend until you make a claim and then forget about any help from them.
Fausto