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When "used correctly" is the key here. I am a believer that simply changing the octane won't necessarily give you better FE, but if you have supporting mods to your vehicle, you CAN get better FE and take advantage of the higher octane. Ask any Corvette owner how the car performs - 85 versus 91 octane.
My car response greatly to mods I perform. With 11 degree advanced timing, I can use 91 octane for a 10% - 15% increase in FE over using 85 octane and factory timing. I am also using non-oxygenated gas. If you do the math and figure cost per mile, 91 octane wins hands down, when "used correctly".
HHO is a curiosity for me right now. If it can TRULY increase FE, my car will know it. Theoretically a 747 can't fly, but it does. I'm not going to spend $200 on a system that will take 10 years to recoup. But to spend $20 and get even 10% better FE, then that might be worth it. Snake oil is snake oil. My great great grandpappy made a living selling snake oil.
I think there might be some here who are using "HHO" with excellent results, but might be lying low in fear of being slammed. It would be nice to see an honest working system. If it doesn't work, then report it as so.
99metro
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