>> You think the latest machines are more efficient and better at cleaning
>> by magic?
>
> No. I think they aren't any more efficient at all.

Why do you think that?

A quick google found this:

http://www.fsec.ucf.edu/en/publications/pdf/FSEC-CR-1772-08.pdf

"For instance, in 1993, the energy per cycle for
dishwashers averaged about 2.6 kWh/cycle along with a hot water use of 
about 10 gallons (38
liters). By 2004, with new energy standards (DOE, 2003) the numbers had 
fallen to about 1.8
kWh/cycle with typical water use of about 6 gallons (23 liters)."

How do you think they managed to do that and still clean the dishes? 
They certainly didn't just adjust the amount of water used.

> Surely trying to tune an engine to get a few percent more efficiency out
> of it is vastly easier than INVENTING the internal combustion engine in
> the first place...

Actually no. You try taking a device that has been under mass production 
for decades and the subject of continuous research. If you could get a 
few % more efficiency then you'd be able to ask for a very high salary 
from a lot of companies instantly :-)

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