Well, I think we all knew the gas filler wasn't going to be on the top. That would've been really cool though! I don't think it has anything to do with worries about people spilling gas on their paint. The Miata has it there for pete's sake. It has to do with simple economics. Why do you think it was moved to the side on the 'Vette? I don't care really anyway.
One question, What's up with the grille? Could this be a V6 grille with the V8 being the single slot grille like the concept? I'm not likeing this grille as much so I'm hopeing that's the case. They have to differenciate the V6 and V8 cars somehow!