all without creating a spectical of yourself and attracting the attention of cops. You can do it on most any freeway and stay within the 70-75 MPH range allowable. Once a week like this will keep the engine cleaned out and healthy and is DEFINITELY recommended for the Northstar in particular.
I do notice after a good **** run she is quieter and sounds healthier. I will sometimes coming off the Highway shift in to 2nd to create what he refers to as over run.. But on a engine as sophisticated as the LD8 is this really necessary ?