Of course, if the fuel is heated it will evaporate slightly easier so it will burn cleaner in a cold engine.
Only problem is that when the engine is cold, so is the coolant and hence the fuel...
It will help. A bit. Even though they name it a fuel converter instead of preheater and charge 10 times what it is worth.
I don't call my HIDs luminosity boosters, my grill block an airflow optimizer or my LEDs candescenses. Though I might in the future
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.