Operation of the windows/fob is in the Owner's Manual. If you didn't get an OM with the car, you can download the PDF on Nissan's web site. IIRC, on my 2009 the windows would roll down until you released the fob button (but it's been a few years and my memory ain't what it used to be).
For a DD that never sees more than about half-throttle, regular gas will probably be OK (the ECM will reduce power output if you start pinging). But who babies a Z? Spend the few extra pennies for premium. Running cheap gas is a lot like using cheap oil - it may work great for a while but not a good long-term plan. IMNSHO, you should only put regular in the tank in an emergency. YMMV
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