Heated air intakes actually started around 1968 and was common on most
vehicles. The idea was to prevent carburetor icing, promote better
combustion and of course reduce emissions. It has really been found that
with fuel injection already atomizing the fuel there is very little
benefit. A preheat system just adds more restriction and the warmer air
has less density so it makes less power.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Wesley Pegden
Sent: Wednesday, February 20, 2008 12:07 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Heated air intakes (was: misc mpg discussion)

I remember a few weeks back somebody mentioned heated air intakes on the
list, and I noticed this was on the page of fuel-saving tips someone
posted a link too.  Anybody tried some kind of heated air intake in a
vanagon?

-Wes