It's already been done. I mean sorting out other fuels like water that turns to hydrogen. There's a cottage industry starting to grow around the "hybred". For a few hundred bucks you can buy or make a hydrogen cell of your own. This is fed into the air intake and helps your fuel burn better = more MPG. Depending on the cell mpg increases are available from as little as 10% to 100%. I think 30 to 40% seems to be the average across this fledgling industry.
A guy called Stan Meyer claims to have gone one step further by driving coast to coast on 23 gallons of water. His claim is he made a new spark plug "capacitor" affair that by means of fluctuating current destroyed water turning it into hydrogren and oxygen at the combustion chamber= water powered.
Hes dead by the way Food poisoning.

How do you tax rain water?
I'll post a link to one of these Hydrogen cell makers. I'm not endorsing the product their punting just that this site has 2 Stan Meyer Youtube films.....watch and learn.
http://waterpoweredcar.com/stanmeyer.htmlAnother guy
John Kanzuis also made salt water burn with radio waves. His search was for a cancer cure....truelly amazing. (
be sure to google this guy) The world will owe him a massive

Added links. If the first film doesn't do it for you the second will blow your socks off.
http://ionlife-healthemail.blogspot.com/2008/02/john-kanzius-putting-power-over-cancer.htmlhttp://www.youtube.com/watch?v=BkzCSNTYWXgTheres some Ausie's who's name I forget make a generator that kicks out 5X more energy than it consumes...amazing.

Now if you really want to
knock yourself out on alternative energy google or youtube anti gravity. Especially in the fields of electromagnatizm. Check out an excentric by the name of
John Searl and his SEG. Russians partly replicated this devise in one of their Uni's. It didn't take off but it did get lighter with a visable Magnetic Hue.
Look up
Hutchison effect.
Telser and
Tesler.
Welcome to energy twilight zone that governments are refusing to fund experiments in.
