Gulf No-Nox (I remember the ad, John "If this Camaro won't knock on Gulf No-Nox, what makes you think YOUR Camaro will?"), Super Shell were "100 octane" at the pump. Each oil company had their own version of "premium" gas, but all were "leaded" AND 100. We didn't have Sonoco stations in California, but guys were known to drive to Las Vegas and bring back many gallons...
Jim
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