http://velonews.competitor.com/2010/...rically_120495

This is super common. Most people should adjust their cleat so the left foot is farther from the bike than the right one.

Everyone has a dominant arm. We also have a dominant foot. Your body is not symmetrical. It often has a twist. You can measure or feel it when you lie on the floor or stand against a wall. Bike fitters use either a 20mm(25.4mm=1 inch) pedal spindle extender or 1mm washers to move the foot farther from the frame.

If you ride a triple you should already have the right cleat as close to the crank arm as possible. This is because of the extra chain ring.

Close to 95% of leg length discrepancies are apparent. Meaning if you measure the bones they are exactly the same. Typically the hips are twisted up/down or fore/aft. This shows up at the foot with one collapsing and one not. The determining factor is your eyes. Your body will acclimate to injury or asymmetric parts(stronger legs/arms) by dropping one leg to keep your eyes perfectly level. Many people who break a leg will have an asymmetry. Not from the broken bone. Instead it comes from the 8 weeks you were in a full leg cast. One of my friends looks like he's still wearing a cast after 25 years.

My wife is one of those special health care practitioners who takes the time to actual figure out why people are in pain rather than applying a band aid and hoping the problem fixes itself. She does 1 1/2 hr initial evaluations and 1 hr hands on treatment(no machines or gadgets).