If I am reading this correctly,

http://www.gruppotirrenia.it/tirreni.../mainframe.htm

It's stating that in high season, from Cagliari-Naples a 1st class lux cabin is 80.05E per person, and a car iss 77.98E.

When I look at this,

http://www.fun.informare.it/ferry/la...uro-napauk.asp

It says for Palau-Naples a type A cabin with 2 beds is 144E per person. A car is 130E. Why the huge difference between the lines?

ttt

Tirrenia is a state-owned company and will usually be cheaper than a privately-owned company like Linee Lauro which, incidentally, now trades as Medmar as it is no longer owned by the Lauro family. Medmar's own website is www.medmarnavi.it.
Cagliari is actually a long way from Palau. If you're heading from northern Sardinia to Napoli, the nearest alternative is Olbia or Golfo Aranci to Civitavecchia which is served by three operators: Tirrenia, www.corsicaferries.com and www.mobylines.it.
You need to compare fares carefully as the different operators have seasonal fares, and standards of cabins vary between ships.

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We did the Tirrenia ferry from Cagliari to Palermo. It was a rusty and dirty old tub in bad need of a major overhaul. Our cabin was dismal at best. If the one to Naples is similar, it could explain why it is so cheap.

Tirrenia Line uses its oldest ferry ships between Cagliari and Naples and Cagliari and Palermo/Trapani.

For more information about the Tirrenia Line Naples to Cagliari overnight car ferry, see my other posting: Palermo to Cagliari Overnight Car Ferry (dated 8/25/2004). It's the same ship on both routes.