----- Original Message ----- Perhaps the reason for the low mileage is
that someone else is getting
extremely high mileage( like 60mpg?).... when their mileage goes down
yours will get better?

Same with the speed. The reason all those deisels go so slow, is that
someone else is using up all the vanagonspeed by going at 130mph, even
if it was only for a very short ( perhaps even theoretical)  time.

awrighty then! so we have A THEORY!!!

Hypothesis:
"there is a fixed and constant amount of Momentum in the Universe,
shared equally by all moving objects."

Corollary:
"that fixed and constant amount of Momentum is Zero."

cause for every northbound vanagon doing 60mph, there is an equal and
opposite southbound vanagon doing 60mph. or possibly TWO southbound
vanagons doing 30mph.
trigonometry also comes into play: vanagons traveling in a northeast,
southeast, southwest, or northwest directions convert
trigonometrically into north, south, east or west components of
Momentum.

this is perfectly observable on the highway. for every idiot blasting
by you at 90mph, there is a rusted old pickup truck (or three)
traveling in the opposite lanes, struggling to maintain 30mph. :)

so now you know why that moron in front of you is going so slooooow:
he's having to cancel out some speed demon going the other way!!! ;)

unca joel