Over the last 5000 miles our X has averaged 17.1 mpg with moderate in town driving and a couple of road trips.

I've been reading a bunch of articles on the web regarding adding Acetone to the gas and supposedly it increases mpg. I figured it was snake oil.

I decided to give it a chance. The ratio widely recommended on the web is somewhere between 1 and 3 ounces added to each 10 gallons of fuel.

I filled up today and added 5 ounces which puts me at the 2 ounces for each 10 gallons since our X's have an approximately 25 gal tank.

We took a 250 mile road trip which consisted of in town driving, mountain grades and normal freeway driving. I reset the trip#2 for the fill up.

I was so suprised to see that by the end of the trip we had gone from 17.1 avg mpg to 23.0 mpg.

Pretty incredible. I thought I'd pass along the info. You can do your own research and you can decided if its worth the risk. Of course I'm not a chemist or a BMW Mechanic so USE AT YOUR OWN RISK.

See attached pic of the result.

Attached Images