There are a couple of ways a truck can run faster than 65 with the speed limiter set to 65. You can change your diff. ratio or tire revs. per mile. The currently do not check these variables, have become aware that these must be checked also, and plan to do so in the future.
Also, Freightliner has something called "SmartPass" It is designed to work with the speed limiter. It allows running faster for a specific amount of time during a specific period. SmartPass has the following variables.
Max Speed. Ex. 70MPH
Duration, Ex. 30 Minutes
Reset Time, Ex. 8 hours.
In this example a driver could run 70MPH for 30 minutes over an 8 our period, then it resets and starts counting again. It is designed to help with passing and other situations that require extra speed when the limiter is set.
Most Canadians I have talked with have these variables set to something like the variables I used as an example. The drivers do not know if this is legal, but some have been checked and passed.
I got my info about a month back while at a Freightliner dealership in CA, talking with both drivers present and service manager.