People buy drivers mainly for the wrong reasons, e.g. Tiger uses it, Rory uses it, I want to look cool, keep up with my buddies etc. If you are taking instruction to improve your game and want to increase driving distance, you need to be fitted for your next driver. There are multiple adjustments for every driver on the market today, the most important being the shaft. It is the engine of the golf club. Would you put a Hyundai engine in a Ferrari? Along with loft, draw/fade adjustments I suggest scheduling a fitting for your next driver so that you can optimize your swing speed and gain some yards.
In response to:
How can good amateurs get even more distance with their driver? Fitness? Swing Improvements?