I've always felt guilty putting "low grade" gas in my car. But then, I
had a sneaking suspicion that this three grade stuff is just a case of
gas companies trying to make a buck by trying to differentiate their
commodity product. Anyway, I'm not the only cheap gas buyer - the
Valero station I'm at just got new pumps, and they have an odometer
that shows lifetime gallons pumped. So far - 23000 gallons of 87
octane, 7000 gallons of 89 octane, 4000 gallons of 91 octane.
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