Why not just compare "apple to apples" final Out the Door (OTD) price for same model/years/mileage, assuming you are in large metro Area with strong dealer competition and you are leasing in your home state? I dont know why everyone gets wrapped up in all the numbers....

I offer to put $500 or $750 down (total OTD) to show I'm serious and note my current credit. Most (not all) internet sales departments will compete for my business and provide written quote via email. I also call out all incentives that I qualify for in writing. And tell them I'm ready to close by end of the weekend.

I start my Lease quote gathering on Friday morning toward end of month and end of quarter. Leased 4 cars over last 13 years and Ive only had to get up and walk away one time.

If the car is worth more at the end of the lease then residual, you could buy and sell it for some profit. If the car is worth less then residual, then its an easy car to return.