AeroShield Wind Deflector
Catalog Item # 34579
This Item is In-Stock and Ready to Ship
$319.99 SAVE $70.00
This is from CW - Pricier than I had remembered, if it saves15% on fuel, you would have to drive LOTS of miles to make it worthwhile. By my calculations (probably not correct), If you drove 2500 miles, got 8.5 mpg = 294 gal @ $3.50/gal = $1030 in gas - 15% in aero fuel saving = $44.40 Not much but but figure you would have to drive the 2500 miles (FL to CO and back) three and one quarter times to make up the basic cost of the airfoil. It might make sense to build one of .25 marine ply and cover it with fiberglass (heavier than this one, though it could be wider) or, more expensive, cover it with carbon fiber or ONLY carbon fiber www.dragonplate.com
has really cool looking carbon fiber pieces but then you would have to drive more miles than I have left in my life - but WOW would it be cool!