Honestly chief, as a number of people on here have said, if the cost of fuel is causing enough issues in your budget that you are mixing octane levels just to save a few bucks, you may want to consider parking the Z in the garage and using it as a toy / weekend car, and getting yourself a daily driver that is fine with 87. Virtually all high-end sports cars say that they need the premium gas, it comes with the territory.
That being said, it all depends on what you are aiming for with the Z. If it is your daily driver (which it is in my case, but I live 4 miles away from work), you really should have budgeted for the increased fuel cost when you got the car. Shaving a few dollars off the fuel bill, while seeming to make good fiscal sense, flies right in the face of the fact that the Z is not a very fuel economical car to begin with.
And if the purpose of having your Z is just to have a fast car that you can play with, but don't necessarily drive all the time, then why would you want to hurt it's performance just to save a few bucks?
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