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Where did this argument come from ?
Just a minor update - I took a 136 mile trip to see.my parents today.
I taped some tufts inside the box cavity, and around the NACA vents.
The good news, is that the ducts seem to be working.
The airflow is blowing to the rear of the car, rather than the wake reversing the flow.
The apparent windspeed at the edge of the duct looks to be the same as that coming from the edge of top of the box cavity.
I'll take video later in the week.
Going by 'seat of the pants' I'd guess that the car doesn't coast like it used to.
However, I just got the highest mileage I have ever seen with the car, and this was at speeds of up to 80 mph, with an average speed of probably 68 mph.
So more testing is needed.
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