2011 Kia Sedona, is double the powertrain warranty worth it?

[fakehuskie]

There is a dealership that offering 20 yr/ 200,000 mile on the powertrain of a new vehicle. This is double of the normal Kia warranty. Until I saw this, I was thinking of a used minivan that would be $10K less than a new Sedona. Basically we are going to run this thing into the ground, so would it be worth it to get this with a huge warranty, or used with less of a warranty?