RMC List - Octane boost question

[Michael Brittan]

Hello All,

I like to use only non-ethanol gas in my cars (Spyder and 2x164/110
Monzas).  87 non-ethanol is available in my area of SE Denver at a
reasonable price.  Preferred 91 octane non-ethanol is available at the
Mobil station in Lakewood, but at a huge price premium and a 30-mile
round-trip (+- 2 gals of gas consumption right there) from my home.

I can eliminate the pre-ignition with expensive octane booster containing
MMT.  Cheaper brands contain alcohols, so defeat the purpose of using
no-ethanol gas and don't raise the octane as much per ounce of dosage.

I'd welcome members' views on using such octane boosters and whether they
may have preferred brands.  Could any harmful side-effects be experienced
with our trusty Corvair engines using these boosters?  What do members feel
about using standard pump 91 octane containing ethanol?

Best,
Michael
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