No the lease factor in this particular situation is non negotiable. The rebates are significantly better for December but the MF is significantly higher. I applied for the 18 month lease in November but couldn’t take delivery then and by the time I was ready, the December incentives were out. Honestly not a lot of difference but with zero down (not to be confused with 0 due at signing!), I ended up saving around $2500 over the duration of the lease compared to November so it made sense for me. YMMV.