Not often you get to update a 15 year-old thread with additional relevant info ...
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Car and Driver magazine tested a 2022 Kia Carnival minivan with & without aero crossbars at 75 mph / 121 kmh.
Quote:
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In the second run, we bested our prior attempt by 3 mpg (25 mpg to 28 mpg), a 12 percent increase and also better than the EPA's highway figure of 26 mpg.
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https://www.caranddriver.com/news/a4...t-gas-mileage/