Top speed is far from meaningless when you're talking about a performance car and the Vette blows the Mustang away in top speed and it's really the miles on the car more than the age and if you're doing proper maintenance, it shouldn't matter, especially on a 7 year old car.
Big difference is drag.
and suspension components and upward lift.
“and suspension components and upward lift.”
Upward lift? We are not talking airplanes.
Seriously, I am sure the Mach 1 can handle 190. May take a few more hp.