I have a Terratrike GT with Bosch. I have milked out a 100 mile ride (century) using 2 batteries (carried spare in bag) it was all on flat trail from Natomas to Folsom lake and back with some miles around downtown Sacramento for lunch. It took a few attempts but I could easily get 50 miles from a battery while increasing the assistance as I got tired. I am a stroke survivor and they said I wouldn't at one point. The Bosch is worth every penny.