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I think we'd have to distinguish between close drafting, and "less-close" drafting.
If you're close enough to physically occupy the low pressure zone behind the lead vehicle so flow off its top & sides attaches to the front of the following car, then both may benefit.
But if the following car is simply driving in the detached/turbulent wake of the lead car, as I believe the BMW was doing a couple of car lengths back) then it's still enjoying some benefit (yes, a smaller one than the bumper to bumper scenario), but in that case the lead car would see no gain.
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