Two SUVs with some similarities, but otherwise different in most aspects such as the model year, powertrain, fuel economy, horsepower, ground shadow size, height, and maximum occupancy. First of all, the 2013 Navigator has bigger and thirstier engine; the 2016 Cayenne Diesel gets 7.5 more mpg. Also, not only Navigator is slightly larger, but it's also taller than the Cayenne Diesel. In addition, the Lincoln Navigator seats two more passengers than the Porsche Cayenne Diesel. Among similarities are the body structure, market segment, and starting price.