It's the 3.0.

after reading the article and thinking a bit, an easy way to add this stuff would be to put it in a bottle of injection cleaner or octane booster, the pour it in, you will have a better chance of all of it getting in there versus just pouring it in, OR if you fill your car up regular intervals as i do, you can add it at the pump then proceed to fill up, this is considering your car will hold the same amount of fuel as last time if not a bit more or less, but i am DEFINITELY going to give this a try as i have acetone at my disposal

I'm on my third tank with acetone. I am using 1 oz per 5 gallons. The first tankful I used 3 oz with the full 18 gallon tank. I filled up with 11 gallons and I added 2 oz, last night I filled 15 gallons so I added 3 oz. My car gets about 20 mpg average, so it is easy to figure out. I pour the acetone into a lucas fuel additive bottle at homne and the dump it in just before I fill up. My MPG is as follows.
1st tank 19
2nd tank 20
3rd tank 20.5
Don't read to much into these figures as the weather is warming up here, so teh car may be getting out of "warm up mode" sooner