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Old 07-31-2013, 10:54 AM
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In my experience tire tread designs/sizes and types have a more dramatic impact on mileage than a tonneau does.
my 06 GMC with a tonneau got within 1mpg of my buddies 1999 without one for nearly 70,000 miles. Generally though, I was a few decimal points higher than him. That might have entirely due to the fact that I had highway tires, and he had LT tires.

However - keeping stuff in the bed dry when you drive in the rain is worth it.
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