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None of that has anything to do with the difference in vaporizing feul before the combustion chamber or in the combustion chamber.
The difference you claim is only that there is unburnt fuel after power or late in power. If that were true the exhaust would be much hotter then it already is or raw gas would be dripiping out the tailpipe. If 20-40% (some people claim their vapor systems go from 30-200mpg so basically 95%) of the fuel is just burnt as extra heat that would be enough fuel to melt the exhaust and especially the cat into a liquid ball of metal after awhile. I think my little buddy heater makes more heat than my converter and it runs for 4 hours on one of those little bottles. My truck dumping 4 gallons an hour for 4 hours even if it were only a 20% waste that's 3 gallons of gas burnt as pure heat in the converter or 2 feet of exhaust before the converter. That is a TON of heat.
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