To guess at what Nissan will do next to keep up with the gov requirements and more so it's compitition you need to look at what nissan is doing now and has done in the past.
First the 35 MPG is a fleet average not for each car. So the higher bulk cars like the altima 2.5 that gets better mpg than the Z helps nissan to meet that mpg goal. So Nissan doesn't need to change the Z at all if it puts out other new models that get more MPGs.
Second the Z has always been a V6. With an occational TT on special models. Don't believe I've ever heard of a Nissan built V8 in a Z. So I don't think they will start now with the new MPG guidelines, that would hurt the average. Unless Nissan has a V8 that gets better MPG than the V6 and cost about the same.
Third with Nissan going to turbos in other cars like this juke that are going to sell more bulk. I think this would help Nissan get turbos into the Z. The more uses you have for the turbo the more you make or buy the cheaper they are. But in a Z there will be more than just turbos.
Turbos make more since to me in a Z than a V8. Just might take some time for Nissan to get the a better bulk rate on the parts.
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