This assumes no technological adaptions towards efficiency. Consider yourself walking a mile and the energy expenditure. It isn't insignificant. Now imagine you

This assumes no technological adaptions towards efficiency. Consider yourself walking a mile and the energy expenditure. It isn't insignificant. Now imagine you have a bicycle. Some bicyclists will train and do century rides, a distance that were never possible merely walking for a day. But these are few bikers overall, most will not maximize capability to that extent but will still be taking advantage of the efficiency of the bike.