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Old 08-21-2009, 08:18 AM   #2 (permalink)
NeilBlanchard
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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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