Unless you're measuring fuel economy with stand-alone equipment in a lab there's no way to get an accurate fuel economy number. The built-in systems cars use is a guesstimate at best and in any case there are too many factors on the street to get a solid, repeatable, number.
The only reason intake preheating was popular in the carbureted era was to get the fuel to evaporate (instead of puddle) in a cold intake manifold. There's no need to preheat intake air on a fuel-injected engine (ok, some diesels do as a starting aid).
In any event, fuel sprayed with an injector isn't in the air long enough to pick up any meaningful heat that would affect evaporation or atomization.
The only reason intake preheating was popular in the carbureted era was to get the fuel to evaporate (instead of puddle) in a cold intake manifold. There's no need to preheat intake air on a fuel-injected engine (ok, some diesels do as a starting aid).
In any event, fuel sprayed with an injector isn't in the air long enough to pick up any meaningful heat that would affect evaporation or atomization.
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