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car magazines
Some car magazines publish factory supplied Cds and frontal area data for SUVs which are based on the truck chassis.
If you calculate the percentage of gross area reflected in these frontal areas,you might use this to calculate an approximation based on the Sierras gross area.
And I believe that Photo Shop has a tool which can be used to ascertain the area of an image when the scale is known." I'll leave that one to the computer gurus.
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One thing to mention.In official reporting to the EPA,for certification purposes,the frontal area of mirrors cannot be included for the vehicle and its drag will reflect the presence of the mirrors,however its Cd will be reported for the arbitrarily lower reported frontal area,suggesting that the vehicle is 'dirtier' than it actually is.
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