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Wire length increase resistance

EFI Wiring Fundamentals

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I have heard elsewhere that a longer wire increases the resistance. Just wondering how true this is and is it significant enough to play a part in sizing qires?

It's true. But unless you're wiring a bus, you don't need to worry about it for car-sized vehicles. Exception is high-current (like battery cable) going to a starter, often the wires are up-sized to improve starter performance.