If you read my wiki and bothered to check my links, water injection on a gasoline engine doesn't appear to boost FE.
Water injection - EcoModder
http://www.files.thinksitout.com/Alt...e%20Engine.pdf
I think you are better off looking for other ways to boost fuel economy on a gasser.
You can always try.
Water injection has proven its self enough for me to where this weekend or next I am going to try and fit a 2003 duramax 40 gallon diesel fuel side tank on my suburban for holding water for the water injection system.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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