Two Sedans with some similarities, but otherwise different in most aspects such as the modifications, starting price, horsepower, fuel economy, ground shadow size, and height. First of all, there is a notable difference in the starting price of the 2018 Audi RS 3, which is $189,700 less than the base MSRP of the 2018 Bentley Flying Spur W12 S. Also, the 2018 Flying Spur W12 S has a more powerful engine and gets 8 mpg less than the 2018 RS 3. In addition, not only RS 3 is significantly smaller, but it's also slightly shorter than the Flying Spur W12 S. Among similarities are the body structure, market segment, and maximum occupancy.