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With the old 4-cyl protege, headlights dropped me by 1mpg. It was a gutless motor with AWD, little things impacted it. In my GP, it has oodles of torque, headlights make no difference. In fact, I've gotten my second best mileage at night (mostly because there was no traffic to bother with). The truck has such rediculous terrible areo that I could run 4 100W offroad lights and it would return the same mpg.
It truly depends on the vehicle. Hence basjoos with his 2-3 loss, his awesome areo anything small has a huge affect.
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