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Nice work, kir_kenix!
I, too, have wondered about the DRL question, as my Corsica has automatic DRL that switch between the high-beams on low power and low beams on regular power, depending on external lighting. My car also has installed aftermarket driving lights (110W together). I have tried switching on and off various lights, the blower, and opening and closing windows while maintaining load on flat ground, to see if any of these had an effect on the instantaneous MPG reported by SG. However, I have found that none of these produce any noticeable change in reported MPG. Although, it is possible that since engine load can fluctuate so easily at highway speeds that these are more likely parasitic loads that produce only minuscule immediate changes, but have a significant cumulative effect.
Again, nice work on this experiment! This is good information here, and finding any inefficiency provides the opportunity for improvement!
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