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Is it possible to build, today, a personal aircraft that not use an impracticable amount of fuel for everyday use? What are the physical concepts that could be used to build it?

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This is an aviation technology question, not a physics question. I believe it's off topic here. –  David Z Jan 4 '12 at 5:17
    
Where should I post this, then? I understand it is perhaps not related to the physics you discuss here, but this is a purely physical question. I editted it anyway. –  Dokkat Jan 4 '12 at 7:38
    
As written it probably is over the edge between physics and engineering/technology. You might try re-posing the question in a different manner. The fuel consumption is a product of both the propulsion technology (efficiency of the engine, efficiency of propulsion method) and the airframe drag (how low drag the shape is, what the desired operating speed is). I think what you are asking is how closely these different factors are bound by fundamental physics limitations versus engineering/technology limits. –  Daniel Chisholm Jan 4 '12 at 16:21
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It is important to note that there is no guarantee that any particular question (even if it is a good question) has a place on the Stack Exchange network. That might point to a viable new site---see Area51 for the process of generating new sites---or it might not. –  dmckee Jan 4 '12 at 19:23
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As just one example, the Cessna Skycatcher carries two people, gets about 16 mpg for 400 nautical miles. The cost is usd149k, which can be financed, and it holds its resale value. Estimated total operating cost is usd.67 per nautical mile. Speed is about 110 kt, and it needs < 1500 feet of runway. –  Mike Dunlavey Jan 13 '12 at 15:06
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closed as off topic by David Z Jan 4 '12 at 5:16

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