[aerohead]

As an 'electric' truck,with a camera system,Spirit measured Cd 0.297.
As-driven,without the Viper windshield,gap-filler,with mirrors,and an open cooling system,she came in at Cd 0.345,same as a ZO6 Corvette.
In 2014,with the old boat tail and more belly pan,she measured as low as Cd 0.244.If measured at the A2 Wind Tunnel,it might have registered Cd 0.219.
The reason being,that Gary DeLassus' Prius-III measured Cd 0.285 at DARKO,vs Cd 0.26 at the A2.
If the same relationship were to hold true with Spirit,then we might not be surprised to see the lower number in North Carolina.
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Spirit-II's best mpg on the trip was 37-mpg at 55-mph,between Ogden,Utah and Fernley,Nevada.
Spirit has never returned over 30-mpg without a boat tail,so I'm pretty encouraged about the upcoming 2020 Spirit-III trip,when she'll have all the whistles and bells.