Not so, of the octane ratings we are talking about the higher ones
definitely give better performance, economy, and lower running temps on a
standard engine. I know, I've experienced the results when having to retard
the ignition to cope with the lower grade. Of course, if your engine has
only ever been tuned to run on the lower grade then you won't know what you
----- Original Message -----
> Of cuss, you don't need all that octane unless you're running a
> much-modified engine.