[rsynnott]

I'm not sure that that's true in a vacuum, and in any case most of the super-high-wattage vacuum cleaners didn't have controls for that (maybe very high-end ones did?)

EDIT: Just noticed the accidental pun; by true in a vacuum I mean true without extra information, not true in a vacuum cleaner :)

[C1sc0cat]

I think many have controls and you could always set it to 80%.

This is a bit like having better VRM's and cooling improves the life of CPU's.