> I wonder whether you cyclists all put as much effort into left
> pedalling as right pedalling and also, whether you pull up as well!
> Mono-pedalling works wonders on pedalling technique I guess...
Most folk have a preferred side. We've got a semi-pro racer here at work, and he claims that you can help share the work more evenly between legs if you count cadence as you pedal, but in waltz time (126.96.36.199.2.3...) rather than in march time (188.8.131.52.184.108.40.206...). Reason being that, even though it might be unconscious, you'll push a little harder on the beat ('1'). If you count in even numbers, that's always the same leg; if you count in odd numbers, it alternates.
Seems to help me on climbs, for whatever that's worth. Not that I'm a great climber, but then that means I need all the help I can get.