If a fuel heater increases atomization as some claim, I would suggest getting your car smogged to get a sense of the amount of unburnt hydrocarbons produced. Modern engines are generally very efficient at burning all the fuel available, but very inefficient at extracting useful energy. If you are worried about unburnt fuel, a warm air intake should be more likely to increase atomization than a fuel warmer.
Unless you live in an extremely frigid environment, I would place the idea fuel warmers in the junk bin.
- LostCause
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