I know I'm late to this discussion, but my folks absolutely love their Cadillac DeVille (non-DTS). I think theirs is a 2003. It gets about 30mpg in highway driving, with the transverse Northstar V8 that shuts cylinders off under light load, and it's super-comfy, with lots of luxury features. It has lots of power when you want it. Nice car. I'm more of a small-car guy, but in the words of an old friend of mine, "It's like riding your couch into a 60" tv."
Probably not as cheap as a Crown Vic, but pretty cheap for how nice it is.
My folks are planning on taking theirs on a big road trip this summer, hopefully I can get a smooth belly pan on it before they leave, to bump the mileage up a little more.
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