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Hybrid Vehicles/Fuel consumption advice

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Question
Do HHO systems work. Is a 50% or higher increase in efficiency possible from installing such a system. How much modification to the vehicle (Nissan X-trail 2009) will be necessary. What is the price range to purchase and install such a system.

Answer
Save your money.  Those mileage claims are outrageous, and water is the ashes of hydrogen.  There are ways to improve mileage, but tinkering with combustion is not very rewarding.  I recommend ecomodder.com for a useful dialogue on the many worthwhile options you have.

Hybrid Vehicles

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Bob Stuart

Expertise

I'm best on questions of the suitability of new technologies, but will try to keep up with retail offerings of hybrid vehicles too.

Experience

Designing human-electric hybrids.

Organizations
International Human Powered Vehicle Association

Publications
4th Annual Velomobile Seminar proceedings, many listserv postings.

Education/Credentials
few academics, but my 1st prototype won a world championship, and I've lectured to engineers.

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