* Condition of the car: A well-maintained engine and drivetrain will perform better than one that's neglected.
* Gear ratios: Different rear-end gear ratios will affect top speed. A higher numerical ratio (e.g., 3.00:1) will result in a lower top speed compared to a lower ratio (e.g., 2.75:1).
* Aerodynamics: Things like tire pressure, wind resistance, and even the presence of accessories can impact top speed.
* Weight: Added weight reduces acceleration and top speed.
So, while 85-95 mph is a reasonable estimate, the actual top speed of a specific 1970 Mustang 6-cylinder could be slightly higher or lower depending on these variables.