According to a recent Mythbusters TV show I saw, you might do slightly better mileage wise with the taigate up.
Mike ------ 1958 Chevy 3200 Fleetside 1958 GMC 100 Wideside ------ Did you get free advice today? To donate to this site using PayPal is fast and EZ. Click here: http://www.stovebolt.com/office/thanks.html