In Tiger Woods' DVDs, he mentions that his normal 8I travels 158 yards. That may surprise some people who have seen Tiger hit 203-yard 8Is from the rough to 15 feet. The key? Tiger's normal swing is at 80%.
Many amateurs falsely believe that trying to swing faster results in higher swing speed. This tends not to be true: timing, rhythm, and balance are all thrown off when you crank up the speed. Your wrists unhinge at the wrong time, your hips slide. Havoc ensues.
Play an entire round of golf at 80% effort. Make comfortable, easy passes at the ball. Don't try to kill it. My guess? You won't lose any yardage (you may even gain a few yards) and your balls will find their targets a helluva lot more frequently.