The Lexus IS350 being AWD only is specific to Canada. You can get the IS350 in RWD in other markets (like the US). For the IS I think its about sales, not performance. In parts of Canada the "snowflake" embossed tires are mandated by law during the winter months. I suspect RWD IS's would be a very small percentage of sales if offered (
not worth the hassle). As far as performance goes, the 2017 RWD IS comes with an 8-speed auto and the AWD version is relegated to the 6-speed. I suspect the RWD version is faster.
I still think when comparing like for like, the RWD version of a car with winter tires will out perform the AWD version with all season tires.
The Fusion Sport is "AWD Only" due to torque steer. Steering with the drive wheels and 380 ft-lbs of torque is not a good time.
For a street driven performance car (even more so if its your daily driver) AWD can't be beat. The 2012 Nissan GT-R with 530 hp (
120-177 less HP) will beat or tie the cars you listed in most acceleration tests due to superior traction (at speed, say something like 60 to 120, the higher horsepower cars will win since traction is less of a factor). Of the cars you listed I have only been driven in a Hellcat. We mostly went sideways and had excessive wheel spin during my drive. Fun yes, fast, eh, maybe on a properly prepared drag strip.
On C&D's 10 quickest cars of the 21st Century only 2 are RWD.
http://www.caranddriver.com/flipboo...0-quickest-cars-of-the-21st-century-so-far#11