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the 10-30mi you are in a store will not cool an engine enough to where it would need to heat back up to be efficient. engine blocks stay warm for hours. heck, my open to the world aluminum Vtwin in my bike doesnt use fast idle at lunch after sitting half a day at work! and like I said, thats an all aluminum deal with no hood or blanket, just literally sitting out in the wind naked.
I also have a carbon fiber hood on my car, with no heat blanket (and thus has cracked the top coat, but thats besides the point), and it used to have a ceramic coated header, and it would take hours to get "cold". now with bare stainless steel race pipes it would take longer.
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