Re: @ledswinger
"extracts 92% of the energy from fuel,"
Ah. no.
That's fine if we are looking at fuel as the scarce resourse. For coal, nuclear, gas, we are. But for solar, given insolation, we've not got a shortage of the primary fuel. We've a cost issue, sure. But if we can (an asumption rather made) get cheap solar then eficiency isn't all that important.
Yes, sure, greater eff is better. But if we can get all the W we want at 3 cents a W, then so what?
Biting the hand that feeds IT
