Regarding the MPG, I just ran out and checked. It's 18.6 off the dash. As for the death wobble, for 2019, I couldn't take the Jeep home because of the factory recall of the steering stabilizer. It was "upgraded". Now as for top speed, I hadn't brought it into triple digits, but it does 85- 90 with no issue. Closed roads of course. This is with 7000 miles on the ODO. Personally, I love it. YMMV.
L J