How much Power do speakers really use ???????

It's the usual "it depend" answer. It depends on how loud it is playing, how efficient the speaker is, how dynamic the music is - especially the bass dynamic content. Also other factors. For many people, there is a listening level that is comfortable, that generally would likely only use a few watts nominally, and peak at some higher values.

On my particular system, I generally listen at about one-tenth of a watt, and peak around 2 watts.

Pbb, my statement was applicable to any system of any power level, as it did not state any defined number of watts. Even high power amps are not played beyond a few watts nominal at moderate listening levels. At peaks, they use more. At higher listening levels with medium efficiency speakers, even high power amps can clip during dynamics, due to the nature of the db scale. If the speaker is around 90db efficient, and you listen around 90db, then you are only using one or two watts nominal, whether your amp is rated at ten watts or 200 watts. The rest depends on the ability of the amp to handle the dynamic peaks into the speaker load provided. In a situation where the dynamic peaks are 15db higher than that 90db average listening level, you require 32 watts above the average power required for that. That is for the 90db efficient speaker that I described above, and listening at the 1 watt level. If you have that 90db speaker and are averaging 8 watts listening level(~99db) then to handle a 15db peak, you would have to supply 256 watts to handle it. If you had a 18db peak, you'd need 512 watts.

Regarding my personal system performance values, I specified that it was my system, not theirs. My system can handle a 90db average listening level with less than 1/10 watt, and can achieve 15db peaks with about 3.2 watts.