Ooh, an LSC, I had 2 of those. Fabulous cars, easy to hop-up with bolt-on Mustang parts, and just a great car for a driving enthusiast (although they have a very heavy feel to them). Both of mine would regularly get 21-23 mpg in mixed driving after some mods, 26-28 on the highway with a talented right foot.
IMHO every C-body guy should spend some time in one and see what they think, as that is an unappreciated car just like a C. I look at 81-83 Imperials and consider what it would take to get one of them to match an LSC, and it's just too much effort. Everything under the skin would have to be upgraded, the LSC has everything already there.