Originally Posted by
350htrr
When I ride 25 miles and use 35% assist I would have actually pedalled 16.25 miles...
EDIT; and yes, if I used 75% assist I would have only pedalled 6.25 Miles and you would have pedalled more riding less...

That assumes that power demand and, by extension, exercise benefits were linear with distance. (Spoiler alert: they're not.)