Originally Posted by MacCool

Cost efficiency. Depends on how much you're willing to spend to get the incremental improvements that have occurred over the last 6 model years. My 2014 is a better car than my 2011 was. Better clutch function, transmission works better, better handling, cooler, better Nav...a bunch of little tweaks that I appreciate. Whether those things are worth the cost to you in terms of buying a 2011 vs a 2014, I don't know. It was for me, but my lease was up and I had to get a new car.

If I was going to buy a used Z, I'd be looking for 2013's or 2014's, no question.