Range depends on how much you use it, on my bike I can easily go 110Kms on a charge using level 1 assist, or 90Kms using level 2 assist or 70Kms using level 3 assist or 50Kms using level 4 assist or barely make 30Kms using throttle only and not pedal... So it mostly depends on how much you pedal... I usually pedal about the same in any level, the difference is the speed you can reach and keep with the assist, level 1=24Km/Hr., level 2=26Km/Hr., level 3=28Km/Hr.., level 4=30Km/Hr., no pedaling using just the throttle=32Km/Hr.
I have done two trips one 650Kms 6 days,the other 850Kms 8 days, and just charged the battery with a solar panel on my camper that the wife drove...
EDIT; Oh, and how much pedaling do I actually put in? I used to average 20Km/Hr. just me pedaling so the difference is due to the E-Assist levels I can use during the ride...