If you drive an Infiniti G35 between the years of 2000 to 2007 what kind of gas do you use?

Im looking to purchase a 2005 G35 now and im trying to figure out what kind of gas i need to use so that i avoid problems with the car. The cars specs lists "premium unleaded fuel tank" which would mean that i would be paying for the most expensive gas every time i filled up? Would this car really make me trouble if i filled up 87 or 89?