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Hydrogen fuel cell kit add on. Makes hydrogen gas from water on demand as its being used. this fuel cell kit will save up to 70% on your gas millage when installed correctly.
this is a single cell kit that fits up to 5.3L engine. if engine is larger you need to get the duel cell kit
I personally tested this kit on my 2001 gmc p/u and was getting 16 mpg, now i get 27 mpg so i did gain 11 mpf with the fuel cell kit installed.