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Of course aero performance is determined by multiplying the drag coefficient by the frontal area...and these babies have a lot of frontal area compared to lower, narrower, narrower tired vehicles....so, they are technically very large sloped bricks...;-)Actually, the Expy Max has a drag coefficient of .35, which isn't that bad. Way better than, say, the F150, which is listed at .56. Drag is proportional to the velocity squared, so the difference in drag between 67MPH and 75MPH is 25%. The absolute best way to reduce drag and improve mileage is to slow down. And I very much enjoy mine, especially getting 24.3MPG.