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Yes, kind of like a 4" x 48" (MOL) pitot tube. The wife has a 2011 Ford Edge and is what we usually 'go' in, It gets mid 20 MPG, but I can 'baby' it to a little over 30 MPG.... a 2012 Ram CTD 2500 (pulls a toy hauler), a 2010 Triumph Thunderbird 1600 and a nearly finished 200 CID, 1966 Mustang 2-door coupe. I need to get the stang on the road and leave the Ram at home! I can't imagine the stang being great on gas, but as for simplicity there isn't much easier to work on. The duct / dam idea came to me years ago when I owned a 66 VW bus, but never did it. I had batted around the idea of adding the duct, to provide the cooling air that would arrive from underneath... pulled up through the engine (hot air naturally rises) then sucked out the back through louvers and the 'great' negative pressure back there. I thought it would reduce drag and lower take a little load off the engine. Probably quite a bit.
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