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But, but, but, but...gasoline vaporizes before ignition, even before it gets in to the cylinder...it's the vapor that burns, remainging droplets usually go (mostly) unburnt...the whole point of rough textured intakes - especially for carburated engines - is to create turbulence that helps breaks down/vaporize droplets....half the point of port injection is to spray on to a warm/hot intake port and make it vaporize better and quicker...
About the only way vapor would not be displacing air is in a direct injection engine. Which uses stupid high pressure to make the droplets as fine as possible (and to be able to inject into an already pressurized cylinder) so that they too vaporize ASAP. Especially important considering they don't have nearly as long to do so.
Point being, except for direct injection, gasoline vapor is going to displace air along the way.
And if you want to bring up propane - which is already completely vaporized at any reasonable temperature - YES, it displaces MORE air than gasoline vapor does, because it simply isn't as dense...takes up more than twice the space that gasoline vapor does. Apples and oranges.
The supposed benefit of the whole idea is that you aren't expelling unburnt fuel through the exhaust. Which automatically makes your gas mileage worse than if it was 100% burnt. And has the side benefit of burning cleaner, like propane, assuming it isn't running rich (you could still suck in more vapor than you have air to burn, so a DIY setup probably won't be great).
Fuel vapor displaces air. Droplets don't burn worth crap. Hopefully the rest of your post is accurate...
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