I bought my 7AT with about the same discount and interest rate last month. The dealer signed me up with a lesser known credit union for 5.75%; but I opted for Nissan's 6.9% as its residual value was higher and no extra admin fees - ended up paying less for the down and monthly on the lease. So read the fine prints.
I am not an accountant, but +2% is only +1.8K in total for a 4 year finance, still less than the extra discount on top of the factory reduction. Besides, those number are meaningless when you're sitting inside your Z, or when the Z you wanted is sold out.
