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Somewhat lost here, but you're saying by wrapping the wires, the air temps don't affect the wire as much, resulting in a cooler wire = requires less amps for same voltage.
Correct thinking? As yes, that would be a good idea. When a metal increases temperatures, the resistance increases. This would decrease efficiency of the system. That's another example of why people install a direct 12V thick gauge wire from their headlights to the battery, less voltage drop.
What kind of thermal wrap are you using? Just a regular wire thermal tape? Kind of makes me wonder if manufactures incorporate a certain level of extra resistance into ECU design for when the motor heats up, resulting in higher wire temps/resistances. Things simple like that could have a reasonable effect on the efficiency...Hmmm. Curious what gains could be had by this, especially on a vehicle like my truck, which melts ice off the hood when fully warmed up, and ignites poor wire choices (speaker wire, oops) under the hood. That was a fun moment.
Short version:
Wrap all the wires in the engine bay. Protect them from heat. Heat = higher resistance = more amps = less voltage (more or less of one or the other). Good idea.
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