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Depends if you use your headlights a lot, then replacing the tail lights, number plate lights and interior dashboard lights (you can have 40W or more worth of dash/ switch lights).
If you don't use the headlights much, these lights are hardly ever on and so the savings are proportionate. I use LED Stop/Tail lights for their improved response time and therefore safety.
People have previously calculated a 2-3 year theoretical payback for LED's. The savings are there but don't expect to measure them. You can see your fuel hit by looking at the scangauge litres per hour at idle, then turn your lights on.
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