Once you look up and understand CAFE, it all begins to make more sense. It has little to do with Jeep but more to do with the Corporate Average Fuel Economy. If you build 50 Dodge Vipers, you need to build 10,000 4 cylinder Jeeps that on paper look to have a higher average fuel economy to stay within the Federal guidelines when you average in the Viper mileage.
Go figure... It's all tied in to government.