Mustangs can be calibrated to compute from mph in excess of 200mph....ask me how I know :p. You have to change some of the coding. I think they default to 199max out of the box.
My car made like 512whp in 6th, and 549whp in 7th, same day 30 min cool down between runs. Mustang load dyno.
Here is a 230mph pull in my old half mile Camaro. Medium boost lmao
https://youtu.be/9OTOhNeucPo