Barry,

It's probably very difficult to get gauge comparative rates because so many things factor in - driving record, age, home location, work location, miles driven per day, etc.

Here is a good starting point - BMW North America has a partnership with Liberty Mutual: http://fs.bmwusa.com/BmwFsPulp/INSURE_Benefits.htm.

This isn't a plug for Liberty Mutual, but since they are affiliated with BMW, it's probably worth checking out.

Regards, Mike