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I've never used any additives and have never had fuel problems. I used ULSD down to single digits but did not get into the colder range cited in that article so maybe that's why. I am interested in hearing more about this.
My truck has a block heater but officially does not. Ford puts them in all the 6.0 engines but includes the electrical cord only if you pay for the block heater or live in a state where it is considered a standard item. The cord is available from Ford dealers for around fifty bucks. I never got around to doing that and the truck started fine winter before last at five below (F). However, the next one will have the block heater and the cord as I'm more comfortable with heating the engine in seriously cold weather.
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