So I am only getting about 16-17 MPG on my 06 SS and I was wondering if that was standard or low? I wanted to see what other '06 users were getting. I also just started filling it up with premium gas after using regular for about 3-4 weeks and have noticed a slight improvement, nothing too noticeable yet. Is there anything I can do to improve the fuel efficiency? I have about 78K miles on it.