The back up lights are something I rarely, if ever, look to for efficiency changes. How often are they ever really lit up?!
Unless you're looking to shave every ounce, and even then, they could be literally the last thing on the list. They serve a valid purpose, no reason to pick on them.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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