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As oldtamiyphile says, probably not much--not measurable at the pump, at least. The turn signals are hardly ever on, of course; same for reverse lights. There are two 5W bulbs in each headlight housing for the parking lights, now replaced with Philips LED bulbs drawing slightly less than 1W each, so ~16W reduction; two license plate bulbs the same, 5W down to 1W, for 24W total saved; two headlights, stock 55W each, now 11W, saving 88W. So, 112W total savings driving at night (the tails/brakes and DRLs are already LED).
All the interior lights are Philips LED now as well, so when I'm car camping I don't have to worry about running the little 12V battery down.
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