I try to save the guy behind me gas, whether he knows it or not. This includes not cutting people off, but also coasting up to red lights and smoothing out traffic waves. It also means accelerating quickly away from a light that just turned green if another driver is growing rapidly larger in your rear view mirror. If there's a bottleneck in the road, try to get as many cars through as quickly as possible. I feel this means driving quickly and following closely, but within the range of what is safe, of course.
I deliberately change into a lane when the distance between cars there is on the rise, and I never merge into contracting flow. So if you're cancelling out a wave, I will jump in front of you while the wave is expanding.
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