i have to drive 50 miles a day, and although i get good mileage (for an american 6 cylinder) i could use a few more mpg's already i use the cruise, set it to 65 and let people get pissed off behind me. that is the speed limit, and i am trying to keep the fuel costs down. it seems to be working. i also use my motorcycle whenever i can. at 40mpg, that helps too.
i bought one of those things to swirl the air and up mileage 25% i bought a cold air ram induction recitifier to up mileage 15% i was told the air filter blocks air flow, so i threw it out, uped mileage 10% i bought a lightening multiple spark intensifier to completely burn all gas fumes, and uped mileage by 25% i bought an atomic magnitizer to align fuel molecules for better fuel flow and atomization. uped mileage 15% i was told that with aligned fuel molecules i didn't need a fuel filter, so i threw it out. uped milage 10% i bought fuel additive from a late night tv infomercial. uped mileage 25% - with just these simple steps i'm saving so much gas, that everyday i have to stop a couple of times and drain gas out of the tank before it overflows.
This seems very similar to a product sold out of Calgary that injected platinum into the air intake to improve milage. There's now a class-action lawsuit against the companies claims that it improved milage. Most people found that it was a waste of money.