Regarding the discussion on fuel efficiency of airtravel:
Driving alone, per mile, is always less efficient than average airtravel efficiency on cutting edge modern jets; see the calcution linked on my website.
You'd have to get over 70 mpg to claim otherwise.
Driving 2 people to a car, is about comparable to airtravel (efficient passenger cars compared to efficient passenger airplanes). You usually have to travel fewer miles going by air (path of the crow is shortest) depending on how long the trip and how nearby the airports are.
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