Yep I did look but wasn't going to take off insides to verify. Our cars are aluminum so does my battery ground cable attach to the body as in a steel bodied car or is it a loop? Can aluminum be used as ground?

 

Have a look under the left side panel in the trunk and you will see it is to the body.

 

As long as the factory provided ground studs are used, the aluminum body is a proper ground.

I am sure the ground stud material and staking process is carefully engineered, because using aluminum oxides can form ruining the connection if it is not designed properly.