So decided to upgrade from the 21 Trek Rail 9 to the 22 Trek Rail 9.8 XT with 750 Bosch smart system. With the larger battery and only using tour mode I am struggling to get even the same mileage that i could get out of my old bike. Only plus so far is the motor seems a little quieter (less rattly) on the downs. I did not expect a huge improvement on mileage, but thought i would at least get 10 percent better running identical tires.