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did a photoshop pixel count to find my frontal area and the value comes pretty close to the W x H x.81 method, although it turns out the data for my car did not included the width of the mirrors, just the body.
so here it goes:
vectra A (hatchback) 1988 - 1995
width-mirrors (carfolio)
1700mm - 66.9inch
width+mirrors (photoshop calculation)
1945mm - 76.57inch
height (carfolio)
1397mm - 55inch
frontal area (photoshop calculation)
1,92 mē - 20,66sq.ft
Cd
0.29 (carfolio .etc)
CdA (calculated)
0,5568 CdA mē - 5,99 CdA sq.ft
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