LED's sound like the better plan from an energy reduction point of view "wast not want not", I have instaled LED,s in my motorcycles but have not done the same for my car. I will see what is available and how much power they draw. On my 80km [50 mile] round trip commute I only have to stop once on the way home at the bottom of a hill. I do a lot of "bump starting" so I don't have to use the battery/starting system much. It seems to me that adding more battery mass woud be the last resort for this potential problem. there are also very expensive light weight batteries if "money is no object".
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