The 2015 Rolls-Royce Phantom is available as a 4-door, 5-seat sedan. Starting at $407,400, the 2015 Rolls-Royce Phantom Sedan is powered by a 6.8L , 12 -cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 19-mpg on the highway. The top of the line 2015Rolls-RoycePhantomEWB Sedan , priced at $ 480,175 , is powered by a 6.8L , 12 - cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 19-mpg on the highway.