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Mythbusters
I think that the 1/24-scale windtunnel models were operating below critical Reynolds Number,so those numbers could be a little squirrely.--------- In full-scale,and without the "throttle feathering" they might have seen a full 50% improvement,which would agree with Kelly and Holcombe's research,constituting a 100% drag reduction.--------- And I'm with Bicycle Bob on the safety aspect at 2-foot clearance.Should the 18-wheeler jam the brake pedal,inertial effects would still allow for a soft kiss since they're starting at identical velocity.If they were touching it would be the safest.( test course driving,not the real world ).
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