As someone who used to drive 89 regularly year round my opinion is one should always mind your momentum. Beware of the worst common denominator (other drivers). Knowledge of the microclimates and geographic peculiarities of the sections of 89 that can be counter to momentum management are key. I used to drive ships (US Navy). Imagine something that weighs 1000s of tons and has no brakes. This mind set is what kept us out of trouble 😊