FUEL.
Unleaded fuels formulated for use in big cities will not deliver as good
mileage as fuels formulated for rural environments.
This is one you can easily test for yourself.
Just run your tank nearly out and fill in the city, next tank do the same
with rural blend fuel.
I'm pretty sure the same goes for fuels blended for high altitudes, I think
it has more punch than low Lander fuels even if the decal marker on the pump
doesn't specify it.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com
----- Original Message -----
From: "John Connolly, Aircooled.Net" <john@AIRCOOLED.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, August 17, 2005 5:21 PM
Subject: Re: How much fuel efficiency gained by shedding 300 lbs?

> wish it was that simple.
>
> I had a 72 beetle that got 4mpg better when it was loaded down with
1000lbs
> of ballast (don't ask) then when it was empty. I suspect it was because
the
> car was much lower, and had less drag as a result. I tested it several
times
> because I thought it was an error. This was hwy MPG.
>
> John
> Aircooled.Net Inc.