It is entirely possible to get a 20%+ improvement in fuel economy simply by changing driving habits, increasing the air pressure in your tires, removing extra weight from your vehicle, etc. It would be very easy for those marketing these products to use some of those techniques to show "proof" of fuel economy well above the EPA estimates for the given vehicle. That would convince a lot of people that the product worked, while in reality the same results could be achieved at no cost, without adding anything to your vehicle.
I do not know the details of the claims made in these reports, so am not suggesting that this is how the numbers were achieved. I just wanted to point out that this could be a possible explanation. I am sure there are dozens of other ways in which one could convince a newspaper reporter that a product was capable of doing something that is not possible.
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Random thoughts from Some Random Guy
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