Not sure how anyone else would do it but I'd go with being able to maintain 15mph on a bike, compared to 6/7 running, or being able to cycle for 60 miles a day, compared to about 5 running, or being able to ride non-stop for 3 hours, compared to about 3 minutes running.psmiffy said:How do you define efficient? as a matter of - context - speed - power use
It seems a very pedantic question, as most everything measurable that I can think of is faster for longer periods on a bike.
This question came to me last week, as I cycled up behind someone running in Windsor Great Park. I slowed to her pace for a few yards, to exchange pleasantries, before cycling off again. Given that she was under half my age and probably under a third of my weight, as well as looking very *ahem* fit, that didn't seem right.