Whats up with the residuals on X5d's

[ddeliber]

I am new to the X5 side of the world so please don't rip me too much. I did search some and couldn't find anything recent and thus relevant so here goes.

I have been trying to figure out something and I just can't seem to understand the logic so I thought that I would ask.

A little background:
I am helping a friend research getting an X5, she has a 2002 and still loves it, but pretty much everything is leaking and it looks like it is time for a replacement. She doesn't know much about cars so I wanted to help her out.

She is looking to go used (hopefully CPO) so I took a look into the lease residuals BMW is advertising and I was surprised to see that the new x5 35d's are at 51% vs 57% for the i's. Why such a big difference? Is it that this is what BMW thinks the cars will be worth or is it something different? Sure the new models come out next year, but wouldn't you think that this would affect all X5s?

Judging by the list prices that I am seeing in the used market for 11s, the d's seem to be right on with the i's even more in some cases. Is there something that I am missing?

from Ride with G:
2013 BMW X5 xDrive35i Premium SUV
36 Month – Residual 57% of MSRP – .00129 Base Rate

2012 BMW X5 xDrive35d Diesel SUV
36 Month – Residual 51% of MSRP – .00129 Base Rate

2013 BMW X5 xDrive35i Sport Activity SUV
36 Month – Residual 57% of MSRP – .00129 Base Rate

2013 BMW X5 xDrive50i SUV
36 Month – Residual 57% of MSRP – .00129 Base Rate

Thanks