Adobe's CTO tells Fast Company that Flash draining batteries is a "False argument to make"...
Adobe Responds to Battery Complaints : Read more
Adobe Responds to Battery Complaints : Read more
Although Lynch has a point here, it looks like his solution to the battery problem would be turning your display off. He continued to state that several studies have confirmed Flash's higher battery life and argued that HTML5 was much less reliable. Unfortunately for all of the battery concerned flash users, Lynch didn't discuss any sort of solution to the problem shown with the Macbook Air.