You can always pick up a very low mile Mercury Gran Marquis for a few thousand bucks. They are the essentially the same chassis as the Lincoln with less trim, but a step above the Crown Vic.
Mechanics and parts are plentiful as they are a version of the Crown Vic fleet car used by many police departments and taxi companies.
They are all REAR wheel drive, not good on slippery roads.
They tend to need valve seals at about 160k. After that fix you can run them up to 300k.
I got about 20 MPG on my Gran Marquis, don’t have it any more.
Good luck with your search.
I got 24 day after day after day making a long commute from outside of Houston. It just never varied. I got 27 like clockwork driving 75 on long trips. Never varied by more than a mpg.
True. One of the best cars ever. A shame they no longer make them. Same V8 as a mustang and I’ll take cubes over revs any old day.