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I saw a demo the other day of a Technocarb dual fuel conversion on a brand new F-250 6.2L, and it worked pretty slick. The engine ECU still controls fueling through a second set of multi-port gas injectors. No fault codes, 02 sensors still doing their job. It flipped between gasoline and propane without even a hiccup. The 4-gas exhaust analyzer showed basically nothing for emissions. They make a dual fuel CNG conversion too that works just as well.
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