Two Sedans with some similarities, but otherwise different in most aspects such as the fuel economy, ground shadow size, horsepower, and height. First of all, the 2016 Hyundai Genesis has a more powerful engine and gets 6.4 mpg less than the 2015 Audi S3. And finally, the 2015 S3 is both significantly smaller and slightly shorter than the 2016 Genesis. Among similarities are the body structure, market segment, starting price, and maximum occupancy.