Epcot Car
Circa 1984,at GM's exhibit at Epcot Center,Orlando,Florida,they had a concept car which had an active diffuser which would lower to near-horizontal at a pre-programmed velocity,presumably when you were on the highway and ground clearance wasn't as much an issue.
This diffuser was designed specifically for improved MPG and they included an animation depicting the improved airflow.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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