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I have to disagree with the argument that more efficient cars will extend the time we can use oil.
There was a study out that showed cars today are actually less efficient than in the 80's when looked at on the whole even though technology has improved greatly. Basically, all the efficiency was used to just make bigger and more powerful cars, so we actually lost efficiency.
If car engines were made more fuel efficient, people would drive more, trucks would replace every other form of product transport, and flying and everything else would increase assuming the technology could be used for planes.
That's the problem with most arguments like this, it's assumed game changing technology will only change one aspect of the "game" but it changes everything, including peoples behavior.
That's why we need different sources of power. Solar, wind, fuel cell, hydrogen, natural gas, etc. That way there will be competition among them which will keep the price reasonable and the technology for each improving, at least for a little while until they all get together and price fix.
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