I live in SD so im pretty used to freezeing temps. The “feels like” as others have said is more what it feels like to you as a person. The truck doesnt give a ####. At worst with enough wind it will cool the truck down faster as whatever insulation is avalible via either actual.insulation or tight spaces is stripped away.
That said with properly treated fuel (anti gel to be clear) your going to be good down to around -10 ambient and with pure #1 fuel will be good down to around -40 (ive had vehicles start as low as -50 with pure #1). However, while it should be fine, its best practice to idle when its going to be below 0 due to the costs of filters, towing, shop time ect.
Additionally as it gets colder the less capacity batterys have. And older worn batterys may not have the umph to get you started even without gelling up at extreme temps.
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