Well, in routes, I go at 100 but when I come by a truck (their legal max is 80), I turn off cruise control and put the truck in neutral. If I have clearence to overpass them, I do it. Otherwise, I stay about 30m away from it l, syncing speed until I can overpass and continue at 100. When someone wants to overpass me, I use the turn lights to let them know when no cars are coming.
Don't go at the top legal speed. Go at the speed you feel comfortable in. I go at 90-100 because lowest fuel consumption. As long as you're under the maximum and over the minimum, you're fine.
but if you're going at 80, don't hog the 100 lane (or any lane other than the 80 for the matter)
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