For me I try to do the limit going under the speed limit on the 400siers is a death sentence literally
. I've seen to many rear end crashes to tempt fate. Mostly I drive 100-110kmh keeping the rpm are 2300-2800rpm going by the hill. When I can, I draft semi's as they do the limit and the drafting effect works well.
For drivers that drive like nuts I can be just as wild as them if not worse. I do not do it often anymore but there are times that some drivers try to act smug when they go around me. The double brake tap dose not always work. I prefer taping twice taking it to 110-115kmh and slowing to 95-100kmh quick only if there is room to allow. I've also been on the 401 and had a driver that thought it would be funny to keep up with me as I sped up. My mind set at the time was to keep accelerating till he backed off took till 160 but he pulled off. I got back into the right lane and let the wind take the car down to 100kmh and keep on going.