Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, market segment, horsepower, fuel economy, ground shadow size, and height. First of all, there is an $8,840 difference in the base MSRP. The 2016 Audi A4 has a higher starting price than the 2015 Chevrolet Impala. Also, the 2015 Impala has a more powerful engine and gets 3.3 mpg less than the 2016 A4. In addition, not only A4 is slightly smaller, but it's also shorter than the Impala. Among similarities are the body structure and maximum occupancy.