Could be for the reasons you already specified:� If at sea level you use X amount of fuel for a given number of revs, then at elevation you use .8(X) fuel for the same revs.� 
�
Or maybe not.� I'm no scientist, nor do I play one online.
�
Stephen

--- On Wed, 1/11/12, Don Hanson <dhanson928@GMAIL.COM> wrote:

From: Don Hanson <dhanson928@GMAIL.COM>
Subject: Was:Re: Oil in Coolant Morphed to "Power at Altitude" or something like that.

� On a side note:���I have noticed a significant increase in miles per
gallon at higher elevations in my inline Jetta gas motored vanagon....I get
around 23mpg as my normal fuel consumption overall, but when I venture into
the high mountains I have seen fuel economy jump to(max) 26 miles per
gallon on several occasions...� Wonder what causes that, exactly?

� Don Hanson