Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, ground shadow size, horsepower, fuel economy, height, and maximum occupancy. First of all, the 2016 Audi RS 7 is priced $308,925 lower compared to the base MSRP of the 2016 Rolls-Royce Phantom. Also, the 2016 RS 7 has a more powerful engine than the 2016 Phantom, but it gets 4 more miles on a gallon of fuel. In addition, not only RS 7 is significantly smaller, but it's also slightly shorter than the Phantom. And finally, the Rolls-Royce Phantom seats one more passenger than the Audi RS 7. Among similarities are the body structure and market segment.