The Americans and the Japanese decided to engage in a boat race. Both teams practiced hard and long to reach their peak performance levels. On the big day they felt ready. The Japanese won by a mile. The American team was discouraged by the loss. Morale sagged. Corporate management decided that the reason for the crushing defeat had to be found, so a consulting firm was hired to investigate the problem and recommend corrective action.

What people say,
What people do,
And
What they say they do
Are entirely different things.
                                      ^{Margaret Mead}

According to the Electric Power Research Institute (ERPI), it only costs $1.36 per year to charge your iPad (source).