This has been around long than the internet. There are those who swear by it and those who say it is a myth. I tried it a while back in a half ton Chevy and didn't really notice any difference. Didn't hurt anything as the truck now has close to 300K miles on it but didn't help anything either. Go ahead and try it, maybe you'll be one of the ones that swear by it.

 

You are 100% correct. I have used acetone for years. On the newer vehicles I have found an increase of about 1.5 MPG. On old school stuff like my 86 F250 4x4 460 I notice NO difference. My wife gets 24 MPG on her 93 Lumina with a 3.1 V6 with acetone. Without it she gets 22.5-23 MPG. On an 04 Trailblazer 4x4 freeway driving 70 MPH with acetone 21.5-22 MPG, without it 20-21 MPG. As for a noticable performance difference I have not seen anything that really shows that. One of the biggest things I DO NOTICE is having to change FUEL FILTERS. I drove that Trailblazer to 80,000 miles and never changed a fuel filter. The Lumina hasn't been changed in 4 years that I know of. My F250 4x4 hasn't had a filter changed in about 6 years. So it does keep the fuel system clean. Now if you have a messed up fuel system acetone will clean it but you may need to change fuel filters for awhile.
In the 1930s Acetone was used in the Indy 500 cars.
I'm giving you my experience of using acetone for over 10 years in diferent vehicles we have owned.

 

Myth Busters already disproved this myth
in fact i remeber it causing alot of problems

 

I thought on Mythbusters they ran straight acetone?

 

Yeah, they did and that FOR SURE will cause problems. They didn't mix it to the appropriate levels.

 

also mythbusters used an older engine. i beleve it had carbs on it. acetone might work differently in fuel injected.