So why don't you use both of them and see if the combination works. I already have this fuel thing on my car and avg. 27mpg was getting only 21mpg before. This is a Subaru WRX BTW. I went 240 miles on half tank of gas which is roughly 8 gallons, most of it was highway miles but couldn't believe it works. Right now, I'm adding acetone to my fuel to see if it works with this thng. So far only did it once and haven't noticed any changes, yet. Still testing.
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