Well, we just call our new 05 X "The X".

However, our 94 Pathfinder, which had been our pride and joy for the last 11 years, now seems like a little putt-putt wagon in comparison.

So we find ourselves calling the pathy "Putt-Putt".

As in:

"Poor little Putt-Putt, are your manifold bolts all achey AGAIN??!!"