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@Gordon Nichols and @DannyP , yeah, I watched the same video, also about a week ago (I guess YouTube's suggested viewing bots know us better than we know ourselves).
Notice how much harder and how much earlier the Cutlass is braking than the Cortina. The less available power, the smoother you need to be.
If you're not racing, and on real roads, you can keep up quite a nice clip with almost no braking at all.
Here's a somewhat related article on motorcycle group riding techniques. See the section titled 'Pace'.
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