On May 9, 2006, at 2:08 PM, Howard Winter wrote:

> Then I turned on the A ircon, and it showed a drop of 5MPG.  I
> repeated the experiment a few times, and it was pretty consistent.

I think the usual argument goes that in hot weather you either run
the air conditioner (increasing engine load, as you say), or you
open the windows (which interferes with the aerodynamics, increases
drag, and thereby increases engine load.)  At highway speeds, the
drag issues is supposed to be bigger (drag goes up with V^2, air
conditioner extra load is a constant...)

That COULD all just be urban legend.

BillW
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