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All electricity in the car has to be generated from gas through motion by the ICE to electricity by the alternator.
From each gallon of gas you could get 8 kWh of electricity - at most; electricity in the car is way more expensive than from the wall.
If it makes sense to switch to LEDs at home, it sure does so in the car.
But I have had several LEDs fail in the license plate holder and some as city lights. Interior lighting does fine, but that isn't on all the time.
I bet it is the heat that kills them.
Lamp housings are much like greenhouses, if you run LEDs in them on a sunny day you may kill them.
So LEDs may be not very useful for permanently burning lights, despite the low usage, unless they have their own housing or enough cooling.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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