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We are seeing buses whether tour coaches or school buses becoming slightly more aerodynamic as are the over the road trucks. A fully loaded tour bus with a Cd of 0.25 might get 20 mpg for a passenger mile per gallon figure of about 1,000. The next question is it clean and comfortable enough to ride 500 miles.
Policy makers here have made decisions based on relatively cheap petroleum fuel and national defense vulnerabilities for the last half century. The assumptions behind public vs private transportation are more idealogical in nature. In the end geography shapes culture and transportation choices. Electric cars and bicycles feed the express bus and train lines.
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