Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, fuel economy, horsepower, ground shadow size, height, and maximum occupancy. First of all, the 2017 Porsche Panamera is priced $219,670 lower compared to the base MSRP of the 2017 Bentley Mulsanne. Also, the 2017 Mulsanne has bigger and thirstier engine; the 2017 Panamera gets 9.1 more mpg. In addition, the Mulsanne is both slightly larger and taller than the Panamera. And finally, you'll seat one more passenger in the Bentley Mulsanne than in the Porsche Panamera. Among similarities are the body structure and market segment.