Hi guys, any opinions about improving the gas mileage by adding a bed cover to reduce turbulence, I keep a large mat in the rear bed area, up behind the cab, and notice it gets blown about at speeds over 40mph. I am getting about 16 mpg ( UK galleons, 4.55 liters) with the 400 / C6 combination, so any improvement will be good. How to attach the cover will present some thought, especially below the rear window area, as that will be lower than the sides? Any suggestions welcome, I see some nice covers on google images of 72 to 79 Rancheros. Cheers guys.