I found the maker website:
A2V-SHUTTLE - Advanced Aerodynamic Vessels
Fuel consumption per pax per mile is divided by 2.2 compared with conventionnal closed taxis while travelling faster. Considering that one A2V-Shuttle is used 320 days a year, 10 hours a day on a 10 nautical mile journey. 10 hours of operation means 3 hours of boarding and waiting, 7 hours of travel, 350 Nm per day.