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Hmm, Not to be a smart ass or anything...But turn the bottle around and read the directions.... /forums/images/graemlins/rolleyes.gif /forums/images/graemlins/eek.gif
What I usually do when I put in fuel system cleaners is dump them in on 3/8-1/2 tank of gas, drive around till I am somewhere around 1/8 of a tank and refill. I usually use Berryman's Fuel System cleaner. It seems to work rather well.
when i buy fuel system cleaners, if it says treats 15-21 gallon, i buy 2 of them since my /forums/images/graemlins/k5.gif has the 31 gallon tank. there are a few out there for SUV's and trucks with the bigger tanks that say they treat up to 30 gal. or so.