It's location, if that's where it really is, is fine with me.
I think if it had been in the same location as the Concept, there might have been complaints from owners of spilling gas atop and down the fender, as well as other "issues".
I'm OK with the location, and I'm also glad to see it on the passenger side. I'm also very happy to see that it isn't like the one on the production Challenger! Personally, I think the "chromed cap"/"aluminum filler look", look "fugly".