Rising Fuel Prices Renew Interest in Fuel-Saving Technologies for Heavy Trucks | Georgia Tech Research Institute
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The tests showed that the techniques could provide drag coefficient reductions of up to 31 percent, which translates to a fuel efficiency increase of 11 to 12 percent. When the energy required by the air compressor installed on the truck to provide the compressed air for these prototype tests was subtracted from those savings, the tests showed that the low-drag techniques could produce an overall fuel efficiency increase of 8 to 9 percent.
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This may have been posted already.
It also looks like it is sucking air in from the side.
