here is the company website
SOLUS - Products and Inventions for Fuel Economy
they have a lot of resources and some PHDs from nasa.
here is some testing results from 2003 that were in an SAE paper
http://www.solusinc.com/pdf/2003-01-3377.pdf
Also they did some full scale windtunnel testing
http://www.solusinc.com/sorhtmodel.html
Of course some of their numbers are conservative. They are out to make money as a business off of other businesses that have tight margins. Any claims they make have to deliver or it will sour the whole market.