We have a new kettle at work, an Intelliboil kettle. You can set it to three different cut off temperatures, 100, 95 and 85 - in case you don't need water actually at boiling, say for coffee or herbal teas.*
There's a little cardboard chart hanging up in the kitchen explaining the three settings. It says that setting it to 85 degrees "saves up to 15% less energy"
Um no. It either uses less energy, or it saves more. Saving less energy is not generally a selling point...
*all meaningless at the moment anyway, since our water system recently showed a bacterial build up, and we can't drink the water without boiling it.