thunderball, i havent read the entire post. do you have at least a 2LPM hho sys? if not, the HHo provided might not be enough to aid in lowering mpg. And i agree the a better EFIE would most likely help by at least 10%

WHen all else fails get a 4cyl. or a middle of the road engine like a 2.5L, the old T100s had 2.7L im looking into getting 1 of those.