I hereby call all lawn mower manufacturers, dealers, advertisers and anyone else who is blithering off this insipid nonsense full blown LIARS! Why, because... According to an FPS - MPH converter, 20,000 FPS = 13,635 MPH! LOLololol omg they have been feeding it to us SO thick! Thirteen thousand miles per hour ... The speed of sound is only 768 Mph~! I should be hearing the SOUND BARRIER Breaking every time I engage the blades! Several times over, the blistering speed of the tips of my mower's blades should be hitting that sound barrier Ka-BOOM -- Ka-BOOM -- Ka-BOOM -- Ka-BOOM !!! But, no. Heck yeah the speed of light is only 186000 miles per hour, according to these folks our lawn mower blades are zipping along at about 6% of that, which may seem slow but it's still faster than most rocket ships and satellites currently in space lol maybe they should be using lawn mower "blade tip speed" technology in the space shuttles of the future. Then again maybe they did. As you can see I was very bored at work today. But seriously, how can they get away with this kind of *(&%^!? Is it just me or do they really think of us as stupid?