Max Mach of the Tomcat is 2.34!
See the numbers far down on the page
Wiki F-14
The speed limit in combat jets is simplified defined by the engine performance and the inlet-temperature of the airflow to the compressor (duct-temp-high).
In Test-flights we did max speed-runs (i flew F-4 Phantom II) till the needle wouldn´t go further, my max speed was 2.23 Mach at FL 390 with the Recce Version RF-4E.
franzl