Have you ever harnessed the wake of a semi truck, draft it to save gas due to lower air resistance? No you haven't because you have to be impractically close to it.
This is because there is strong flow reversion and turbulent recirculation behind a semi. The recirculation is so strong that it stops the wake from extending very far behind the truck.
Therefore the only way to draft a big ol truck is to ride its bumper. Where the recirculation and flow reversal actually pulls you forward. Similar to how trout use flow reversal behind their scales to swim against the current.
A car with a smooth streamlined wake is the ideal drafting partner. The slow smooth wake extends further behind the car, and affects a trailing car that's further behind.
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