Keep it! I like the light-colored interior. My '03 Park Avenue had the same, non-supercharged engine, and though it was longer and heavier than the LeSabre, I saw 21-22 mpg combined on regular gas (70% city driving) and 30-32 on the highway. The LeSabre should be able to match or even beat that while giving you the classic Buick ride.
Maintenance and repair: I had little trouble with the PA. It used a little oil, less after I started filling with QS Defy. There were entire months during its 6.5-year tenure where all I did was put gas in it, check the oil and maybe top off, and keep it clean inside and out.
The bells and whistles gave no trouble. As for the old man/Buick image, you can (a) drive it like Fangio or Stirling Moss in a Mercedes, (b) trick it out as spasm3 suggested above, (c) do both, or (d) say "Scrooo 'em."
Maintenance and repair: I had little trouble with the PA. It used a little oil, less after I started filling with QS Defy. There were entire months during its 6.5-year tenure where all I did was put gas in it, check the oil and maybe top off, and keep it clean inside and out.
The bells and whistles gave no trouble. As for the old man/Buick image, you can (a) drive it like Fangio or Stirling Moss in a Mercedes, (b) trick it out as spasm3 suggested above, (c) do both, or (d) say "Scrooo 'em."