Several Big Rigs and now an RV getting 20-25% improvement on fuel. A simple hydrogen fuel cell under the hood did the trick. Self made from instructions on the web at www.hhowater4gas.com Hard for me to believe till I saw the guy who did it on his RV. For more info go to national radio show coasttocoastam.com with George Norry and click on "water4gas"
Many a O-O is threatened with going out of business - hope this helps them out.
Ken