I don't think the tq motor is significantly more inefficient than any of the others. I did a ride yesterday with a mate with an orbea rise M20 , we rode at the same pace, but he is lighter than me by about 5 or 6 kilos, his bike has faster rolling tyres,and most importantly he is fitter than me. I finished with 28% battery remaining ,he finished with 35% remaining, that seems like they're about evens to me taking into account his lighter weight,quicker tyres and better fitness.
Obviously this is all anecdotal,but I don't think the tq motor has any problems with efficiency.