By the way, when I am forced to use Regular Pemex (green pump)
the ill effects are usually noticeable immediately if I must push my van
up a hill or look for reasonable passing speed.
It almost feels like a tank of "bad gas."
Premium is available in *most, tho not all, Pemex stations--
Pemex stations are multiplying rapidly & more now have Premium.
Phaedra

----- Original Message -----
From: David Beierl <dbeierl@attglobal.net>

> That would fit with these remarks from
> http://www.rversonline.org/ArtMexFuels.html -- according to him (her?)
even
> the mid-grade is less than 87 "American" (R+M) octane.
>
>
> >NOVA
. Curiously, running the fuel through a
> >engine does not produce immediate results. It's only after a hundred
miles
> >or so, that the full effects of it's low octane begins to
> >cause pre-ignition and detonation.