Please find below the original description added from the owner of that car:

“SETRA bus saves 7.3% Diesel in a time test comparison!

A time test that lasted over 3 months with a three-axle bus, SETRA 417 GT-HD, shows once again how great the savings potential with the BE-Fuelsaver® is and how the fuel consumption goes back to the starting point once the ECO Fuel Saver pin is removed again.

http://www.verkehrsdienste.at/eportal/

Both attached tank books are based on the WLV’s audited tank lists and demonstrate savings of 2.5 liters/100km, with this one saves at an average Mileage of 80.000 km per year 2.074 Euro. The calculation shows that the amortization of the purchase price already takes place within 6 months. (2014)”