On Wed, 14 Apr 2004 03:51:16 GMT, wrote:

I have had several vehicles over the years that produced enough extra
power (and therefore economy) on hightest to MORE than pay the
difference in cost.


This story has been told many times before by would be experts.
It is the stuff of which Urban Legends are made.

There are many variables, but if one accepts that there is
a realistic 10% increase in horsepower from the use of
high compression pistons, the MAX SAVINGS is 10%....
IF regular and hi-test cost the same - and they don't.

Highly refined"HI-TEST" will never replace LOW GRADE
diesel when it comes to real power and economy.

There are more BTU's in a gallon of "regular" than HI-TEST.
There are even more BTU's per gallon available in DIESEL.

BTU's per gallon is the key to miles per gallon.


YMMV - pun intended