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I said this earlier in the post
You want fuel as cool as you can get it so long as they injectors and pumps can handle it.
All fuel quenches the chamber whether its a vapor or a liquid or a mist. Obviously liquid quenches the most, then mist then vapor. the vapor only cools because its at a lower temperature.
Any cooling of the cylinder allows for increased torque at a given rpm. That allows you to put slightly less fuel in and get a more complete combustion, intake, and exhaust. Cooling of the cylinder also drastically increases engine life(so long as its not drastic, like pouring water into a cylinder).
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