2017 GMC Sierra 1500 Denali Ultimate 36/12 Help

Looking to lease a 2017 GMC Sierra Denali Ultimate which is a Demo car (3k miles).

MSRP: $64,245
Rebate: $3k
Dealer Discount: $7k
Advertised Discounted Price: $54,245

I wonder if I can get a better negotiated price and what things to ask. I will be negotiating tomorrow Jan 2, 2017. Also, like to request for RV and MF on 36/12.

Thanks,
PC