dont worry about it.
when your car is new, you cant (shouldn't, unless you believe in breaking it in by the dyno) rev it above 4kRPM's or so.
the lower octane gas will not do anything to your motor, as a mater of fact, if you plan on keeping the engine below 4krpm for 500+ miles (break in period?), then you might as well use regular gas for the 500+ miles. (although I wouldn't, the price difference isn't much of anything)
the reason premium is required is because the 370z's engine has high compression which will make low octane gasoline detonate BEFORE it reaches the combustion stroke.
there is an exception to that - which is if the engine is not under stress to put out the power, then the gas will not misfire, thus making 87 octane perfectly fine to use. You just have to remember not to floor it.
on top of that, many new cars have smarter ECU's that will regulate the misfiring to prevent damage. (although not all cars have it, and not always successful)
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