Well from what I have heard so far is that the New Camaro will have 2 V6s and 3 V8s to choose from. My guess is it will more likely be 1 v6 and 2 v8s. A 3.9L v6 and the new 6.2L LS3 and then something unknown at this time for the SS, possibly something with lower cubes and a supercharger. Thats my guess. And as far a fuel economy goes I think the v6 will get the same highway mileage as the Z28 v8 (LS3).