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Old 05-01-2010, 09:27 AM   #4
V
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Ive heard the thickness also matters, even a 1/16" difference and the manufacturing process of the reflective covering will affect interior temps up to 2degrees. Maybe buy a few and keep them looking new so you could still return them, but do tests at the same time of day using a infrared thermometer inside the car on days of equal ambient temps. The compare data and keep the most effective one and return the others.
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