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Hi & welcome to EM,
It should make a small difference -- probably way too small to matter. LED headlights would make a bit more of a difference, but still fairly small. The lights are only on part of the time, and they are very low consumption compared to many other things:
Running without A/C makes a large difference. Figuring out how to eliminate the alternator would make a large difference. Making tire pressure and/or aerodynamic improvements will make large differences. And of course your driving techniques can make a large difference.
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