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I think the trick is water injection actually doesn't do anything at all when you are trying to get increased fuel economy.
A dangerous mix of high compression, regular gas and lean burn for economy.
Then water or water and methanol injection to tame air fuel detonation under high load, so you don't have to burn aviation gas all the time, which is expensive and not economic at all.
Assembly line made gasoline engines are designed to be mild enough to not benefit from water injection. So power and possibly fuel economy suffer.
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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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