I am a big guy to begin with so I am impressed. I usually ride in PAS 1 and change gears as needed(I have changed front and rear gearing), with PAS3 for hills. If it is windy I may use PAS2. Riding in the lower assist will get you the mileage, I was wore out but still had 2 bars on the battery when I completed those 52 miles. It is pretty flat here in Hampton Roads/Norfolk. I honestly believe I could stretch it to 65, maybe even 75 miles but that record is for a later time when I am in better shape. LOL