At 06:49 PM 7/14/2008, Loren Busch wrote...
>Not one response here that I read of anyone that atually
>installed one of these packages, did any real controlled tests, and
>got a
>good result.

Anyone stupid enough to buy into one of these scams is also too stupid
to do a proper controlled experiment, and probably too stupid to even
calculate fuel economy correctly.

For those old enough, the same sort of foolishness went on during the
late '70's "oil crisis."

By far, the most significant factor in improved fuel economy is careful
control of the fuel/air mixture. For Vanagons, that might translate
into using a Megasquirt, which is much more advanced than the
technology available to VW when the Vanagon was designed.

Next in line is lowering weight and aerodynamic friction, tough to do
much about either with a practical Vanagon.