Bruce wrote

On 12 Aug 2009 21:52:43 GMT, "Michael R N Dolbear"
wrote:

Note that train energy figures include Air Conditioning, the
standard
car figures exclude it.

Air conditioning is an interesting topic. It does use a small
additional amount of fuel, but in a car, that additional amount is
smaller than would be caused by the increased drag when the windows
are opened.

Even if that is true and relevant, the standard car figures have the
windows closed (as well as AirCon.excluded/ off).

--
Mike D