Originally Posted by
spankytoes
...However, if you are traveling with at least one more person, it’s cheaper to get a cab as FCO now has fixed rates of 40 or 45 Euros to the city from the airport. You won’t get the same consideration on the way back though....
Since this thread is again current, thought I should provide some corrected info to the post quoted above (bolding mine). The fixed rate for a cab either going to FCO from the city center, or vice versa is now €48.
Here are some official links:
Taxi - Info, fares, infoline
How to move in Rome by Taxi
And I don't quite follow
spankytoes math regarding what's less expensive. The Leonardo Express train that goes from FCO to Termini Station is €14 per person.
But there are actually cheaper ways than this to get from FCO to Termini (or vice versa) - with the least expensive way being
Terravision's direct non-stop shuttle for €4 per person.