I think that they are also considering europe as a market for the camaro and in Europe there is an annual tax mainly based on the cid(cmc) that beeing said it has to be 4 banger and tiny 2 liter. Also in Europe the gas price is a fair big amount double than the price in US so it has to be a high mpg car. In some countrys in Europe the annual tax is approx 2500$ or probably more for the 376 CID(6162CMC)!
P.S. I heard that they are trying to introduce somwhat of a tax like this in USA....maybe GM knows something about it....