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Originally Posted by elninoalex
Well said! I use 3oz to 10gal also for max mpg. I've read you can go up to 5oz to 10gal to further decrease emissions, even though it can hurt mpg.
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Yes,It will hurt MPG with too much. I usually use it every other tank for best results. I've found that when first starting to use it after not using it for awhile, It's best to do 2 tanks in a row then drop to every other tank.