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FYI, removing the roof rack (including cross bars) from my brother's '05 Pontiac Montana was good for a 2.8% improvement in fuel economy at 55 mph / 88.5 km/h.
In MPG (US), from 32.8 mpg (racks on) to 33.7 mpg (racks off).
This was determined with cruise controlled, bi-directional runs on an empty, straight, level road. (One bi-directional run with racks on; 6 with racks off.)
Of course, the faster you go, the larger the % savings will be.
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