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Do you mean the full bed cap or a tonneau cover. The full cap weighs considerably more so the weight would hamper your mileage a bit. The tonneau according to some will help mileage.
Mythbusters did this test and they say the gas mileage was a tad lower once installed. I will have the body coloured fibreglass tonneau installed shortly and with doing this twice before I found the mileage stayed the same.
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