airflow
The subject is an important one and your numbers resonate with something I ran across long ago.
But with so many different pickups out there( and cars ) I kinda just let go of trying to get a handle on it and focus on empirical data for mods which demonstrated hard improvements.
The half-Zeppelin is the benchmark for efficiency with the upper portion and under-belly of the HONDA Dream-2 solar car,the model for everything down under.
Anything which pushes a vehicles structure in those directions is sure to benefit at the pump or charging station.
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