acetone

So i found this video, and it talks about a couple known tips, but then about Acetone.. I have NEVER heard of this "secret tip" before. So, is it safe? does anyone know? Im not putting this sh*t in if its a problematic solution.. I know there is A Lot of info on it online BUT, [B]has anyone...

i seen a video on you tube that shows a 10mpg increase in mileage by adding pure acetone to each tank full. don't remember the amount but it looked like half a standard size coffee mug. im also wondering if this will in anyway hurt the engine or oxygen sensors in the long run. if this acetone is...