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Originally Posted by stovie
with a higher cr you get higher temperatures on the compression stroke which water takes care of and can allow you to drop octane down instead of buying the higher octane
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Maybe it could be more cost-effective to use a lower amount of higher-octane fuel instead of going lower in the octane rating.
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waters rate of expansion is far higher than air is so having some water injected into your engine either way can improve its performance whither its power or fe specifically it's still a benefit in the end
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I'm not sure to which point it would be so great to add steam, since it's already expanding and would displace some oxygen at the intake tract and decrease the effective compression. Water droplets might be still better in the end, because there is more expansion left to happen inside the cylinders and it may retain more residual heat that would otherwise be wasted through the cylinder walls.