Well, I supposed I was missing your point, since it's generally unspoken but understood that .0 is part 1 of a chapter and .5 is part 2 of the same chapter. So by that convention, 5.5 would be part of Chapter 5, thus Season 1. I didn't even think that anybody had any doubt about that part.
Actually, there are 2 other cars shown. The first one is the silver car that Bella was sitting on is a Porsche, not Audi. Or more specifically, it's based on the Porsche Cayman GT4 RS.
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The second "other car" was a picture of her in a car with only her leg sticking out and visible. That's an entirely different car based on a Mercedes roadster, but it's a little hard to tell if it's the C or E or S class roadster, as Mercedes has gone really deep towards the "1 sausage, different size" design concept for its cars.
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C-Class
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E-Class
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S-Class
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