Dude, you can TOTALLY drive 55 miles per hour, sometimes faster, provided you are driving on a road with a posted speed limit of 55 MPH or higher. I know for a fact that, here in Michigan, there are stretches of highway where the speed limit is as high as 70 MPH! I just thought you should know because you seem to be under the impression that you cannot drive 55.
I suppose, theoretically, you can drive as fast as you want, or at least as fast as your car will carry you. The problem with that is that you might get a ticket or endanger yourself or others. Whatever you decide to do, BE CAREFUL!