Depends what Offroad means.
Single track with technical stuff is 40-45wh/km
Going fast like an mx track you hit easy +60wh but motor Temps will slow you down quick.
And... Riders weight is a huge difference... Even it's flat on street.
I tested alot with my girl (50kg) vs me (90kg)
On a road legel 25km trip Iam at 27wh/km
She hits only 19wh/km
Thats incredible.
With a stock surron battery, 1 year old 2500 km on it the did 72km in one charge.
"men" a are happy if they get 50km a charge.
Of course we switched also bikes to eliminate tire differences, gearing etc.
Summary : bigger guys need bigger batteries
Single track with technical stuff is 40-45wh/km
Going fast like an mx track you hit easy +60wh but motor Temps will slow you down quick.
And... Riders weight is a huge difference... Even it's flat on street.
I tested alot with my girl (50kg) vs me (90kg)
On a road legel 25km trip Iam at 27wh/km
She hits only 19wh/km
Thats incredible.
With a stock surron battery, 1 year old 2500 km on it the did 72km in one charge.
"men" a are happy if they get 50km a charge.
Of course we switched also bikes to eliminate tire differences, gearing etc.
Summary : bigger guys need bigger batteries