On a recent Ducati ST4 trip using E0 my fuel mileage calculated at each fill up ranged from 48 to 58 mpg. At home, using the witches brew available in my US area, I usually get 43 mpg on the same bike. The other four bikes on the trip, mostly late model BMWs had the same efficiency improvement. The biggest benefit of E0 for me was the much improved range. I'd like E10 to go away... and E15 never to arrive.