One of the things I like about my Bosch Nyon display and associated eBike Connect app is that for each ride, the app calculates and displays the amount of "work" the motor did and the amount you did (as a percent). I ride almost exclusively in the Eco mode (lowest assist level) and on most rides the app shows the motor provides 40% to 42% and I provide 58% to 60%. I know it is just some algorithm Bosch uses and one could argue with the formula, but I find it helpful and motivating.I look at it this way. I ride my conventional bike 20 miles during an average workout.
With an average load, my ebike is capable of doing 20 miles on a single charge using electric power alone.
During an average ebike workout, I ride 50 miles on a single battery charge.
The bike provides the energy for 20 of those miles and my pedaling is responsible for the remaining 30.
This means I'm providing the energy for an additional 10 miles during each outing, a 50% increase.