So, then an EPA of
at least 23mpg would be your best with the RX8, while still being the 'worst' rating for the Camaro, right? Also, as been stated: GM's V8s have a tendancy to deliever much better fuel economy than the EPA gives them credit for...I'd consider that a reasonable fuel economy increase
(especially considering the power increase you're getting!)
.
If the EPA rates the Camaro at the G8's 24mpg hwy, AND it has a stick
...you've got an easy choice on your hands given your criteria, right?