In reality, you must hit the ball on the upswing a bit.

however

When attempting to teach someone a technique for driving longer, it is important to use words that will translate into a feeling. Driving "through" your target can help accomplish that. Telling someone that you must hit a driver on an upswing will lead to a pulling of the lead shoulder and create short swings that will have a tendancy to slice.

As far as the accuracy of the swing velocity equipment I cannot be sure (I am not the owner of the equipment or the calibration tech), but those were the figures I was given before the drive increases. At last years LipovitanD Long Drive Regionals in Khon Kaen Thialand I went 302 yards with a velocity of 105mph (9 degree).

Since then, I'm sure my bigger 330+ drives are undoubtedly faster. The physics of "releasing the forearms" will generate more clubhead speed naturally, but I havent seen a reading since then. I would be curious to find out.